Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, by Balance Sheet (Details)

v2.4.1.9
Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, by Balance Sheet (Details) (USD $)
Mar. 31, 2015
Feb. 28, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt $ 85,664,000us-gaap_LongTermDebt    
Convertible Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 69,564,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
  0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Equity component of convertible debt 13,000,000us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
13,000,000us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Notes Payable      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 2,760,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
  3,015,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
Fair Value | Convertible Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 81,469,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
  0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Fair Value | Notes Payable      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 2,760,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
  $ 3,015,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember