Other Current Liabilities - Schedule of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities, Current [Abstract]
Accrued legal	$ 3,096	$ 1,458
Accrued services	473	849
Income taxes payable	164	129
Other current liabilities	676	563
Total other current liabilities	$ 4,409	$ 2,999