Income Taxes - Reconciliation of the Federal Statutory Rate to Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income tax rate	34.00%	34.00%	34.00%
Foreign rate differential	(49.60%)	151.50%	(26.10%)
State tax, net of federal benefit	13.40%	(0.90%)	67.60%
Permanent Items:
Change in fair market value of stock warrants	0.00%	0.00%	(2.40%)
Incentive stock options	1.00%	(14.90%)	2.00%
Dividend from foreign subsidiary	53.50%	(79.80%)	45.20%
Amortization of technical rights	(34.50%)	23.40%	(6.60%)
Deferred adjustments	30.60%	6.60%	1.80%
Other	(1.10%)	(0.50%)	0.80%
Effect of permanent differences	49.50%	(65.20%)	40.80%
Effective income tax rate	47.30%	119.40%	116.30%
Change in valuation allowance	(45.80%)	(119.70%)	(104.00%)
Effective income tax rate	1.50%	(0.30%)	12.30%