Quarterly report pursuant to Section 13 or 15(d)

Common Stock, Stock Options and Warrants - Restricted Stock Units (Details)

v3.5.0.2
Common Stock, Stock Options and Warrants - Restricted Stock Units (Details) - Restricted stock units
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Units:  
Outstanding, beginning balance (in shares) | shares 408
Granted (in shares) | shares 532
Vested (in shares) | shares (43)
Forfeited (in shares) | shares (42)
Nonvested, ending balance (in shares) | shares 855
Vested and expected to vest, ending balance (in shares) | shares 587
Weighted Average Exercise Price (in usd per share):  
Outstanding, beginning balance (usd per share) | $ / shares $ 12.71
Granted (usd per share) | $ / shares 7.90
Vested (usd per share) | $ / shares 13.23
Forfeited (usd per share) | $ / shares 12.15
Nonvested, ending balance (usd per share) | $ / shares 9.72
Vested and expected to vest, ending balance (usd per share) | $ / shares $ 9.78
Nonvested, aggregate intrinsic value at end of period | $ $ 5,677
Vested and expected to vest, aggregate intrinsic value at end of period | $ $ 3,732