Fair Value Measurements - Schedule of Additional Information about Assets Measured at Fair Value on a Recurring Basis (Detail) - Unobservable Inputs (Level 3) [Member] $ in Thousands |
9 Months Ended |
---|---|
Sep. 30, 2016
USD ($)
| |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |
Fair value of Thera Warrant | $ 5 |
Balance, end of period | $ 5 |