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Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Beginning Balance $ 2,054
Payments (77)
Accretion
Cancellation of Obligation/Conversions
Mark to Market (71)
Ending Balance 1,906
Underwriter Warrants [Member]  
Beginning Balance 473
Payments
Accretion
Cancellation of Obligation/Conversions
Mark to Market (71)
Ending Balance 402
Asuragen [Member]  
Beginning Balance 1,581
Payments (77)
Accretion
Cancellation of Obligation/Conversions
Mark to Market
Ending Balance $ 1,504