Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Assets and Liabilities - Recurring Basis (Details)

v3.19.3
Fair Value of Assets and Liabilities - Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets    
Securities owned, at fair value $ 4,601 $ 10,923
Liabilities    
Contingent consideration payable 2,520 2,230
Liabilities 35 2,575
Fair Value, Measurements, Recurring | Carrying Value    
Assets    
Total assets 4,601 10,923
Liabilities    
Contingent consideration payable 2,520 2,230
Total liabilities 2,555 4,805
Fair Value, Measurements, Recurring | Carrying Value | Certificates of deposit    
Assets    
Securities owned, at fair value 289 426
Fair Value, Measurements, Recurring | Carrying Value | Debt securities    
Assets    
Securities owned, at fair value 627 1,447
Liabilities    
Liabilities 29 196
Fair Value, Measurements, Recurring | Carrying Value | U.S. treasury notes    
Assets    
Securities owned, at fair value 711 794
Fair Value, Measurements, Recurring | Carrying Value | Common stock and warrants    
Assets    
Securities owned, at fair value 2,974 8,256
Liabilities    
Liabilities 6 2,379
Fair Value, Measurements, Recurring | Fair Value    
Assets    
Total assets 4,601 10,923
Liabilities    
Contingent consideration payable 2,520 2,230
Total liabilities 2,555 4,805
Fair Value, Measurements, Recurring | Fair Value | Certificates of deposit    
Assets    
Securities owned, at fair value 289 426
Fair Value, Measurements, Recurring | Fair Value | Debt securities    
Assets    
Securities owned, at fair value 627 1,447
Liabilities    
Liabilities 29 196
Fair Value, Measurements, Recurring | Fair Value | U.S. treasury notes    
Assets    
Securities owned, at fair value 711 794
Fair Value, Measurements, Recurring | Fair Value | Common stock and warrants    
Assets    
Securities owned, at fair value 2,974 8,256
Liabilities    
Liabilities 6 2,379
Fair Value, Measurements, Recurring | Fair Value | Level 1    
Assets    
Total assets 615 7,496
Liabilities    
Contingent consideration payable 0 0
Total liabilities 6 2,379
Fair Value, Measurements, Recurring | Fair Value | Level 1 | Certificates of deposit    
Assets    
Securities owned, at fair value 289 426
Fair Value, Measurements, Recurring | Fair Value | Level 1 | Debt securities    
Assets    
Securities owned, at fair value 0 0
Liabilities    
Liabilities 0 0
Fair Value, Measurements, Recurring | Fair Value | Level 1 | U.S. treasury notes    
Assets    
Securities owned, at fair value 0 0
Fair Value, Measurements, Recurring | Fair Value | Level 1 | Common stock and warrants    
Assets    
Securities owned, at fair value 326 7,070
Liabilities    
Liabilities 6 2,379
Fair Value, Measurements, Recurring | Fair Value | Level 2    
Assets    
Total assets 3,986 3,427
Liabilities    
Contingent consideration payable 0 0
Total liabilities 29 196
Fair Value, Measurements, Recurring | Fair Value | Level 2 | Certificates of deposit    
Assets    
Securities owned, at fair value 0 0
Fair Value, Measurements, Recurring | Fair Value | Level 2 | Debt securities    
Assets    
Securities owned, at fair value 627 1,447
Liabilities    
Liabilities 29 196
Fair Value, Measurements, Recurring | Fair Value | Level 2 | U.S. treasury notes    
Assets    
Securities owned, at fair value 711 794
Fair Value, Measurements, Recurring | Fair Value | Level 2 | Common stock and warrants    
Assets    
Securities owned, at fair value 2,648 1,186
Liabilities    
Liabilities 0 0
Fair Value, Measurements, Recurring | Fair Value | Level 3    
Assets    
Total assets 0 0
Liabilities    
Contingent consideration payable 2,520 2,230
Total liabilities 2,520 2,230
Fair Value, Measurements, Recurring | Fair Value | Level 3 | Certificates of deposit    
Assets    
Securities owned, at fair value 0 0
Fair Value, Measurements, Recurring | Fair Value | Level 3 | Debt securities    
Assets    
Securities owned, at fair value 0 0
Liabilities    
Liabilities 0 0
Fair Value, Measurements, Recurring | Fair Value | Level 3 | U.S. treasury notes    
Assets    
Securities owned, at fair value 0 0
Fair Value, Measurements, Recurring | Fair Value | Level 3 | Common stock and warrants    
Assets    
Securities owned, at fair value 0 0
Liabilities    
Liabilities $ 0 $ 0