Significant Accounting Policies - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 25,342	$ 36,079
Restricted cash	10	94
Total assets	25,352	36,173
Warrant liability	5	115
Contingent consideration	45,100	0
Total liabilities	45,105	115
Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	25,342	36,079
Restricted cash	10	94
Total assets	25,352	36,173
Warrant liability	0	0
Contingent consideration	0
Total liabilities	0	0
Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets	0	0
Warrant liability	0	0
Contingent consideration	0
Total liabilities	0	0
Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets	0	0
Warrant liability	5	115
Contingent consideration	45,100
Total liabilities	$ 45,105	$ 115