Income Taxes - Reconciliation of Statutory Federal Tax Rates and Effective Tax Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory federal tax (benefit) rate	$ (4,526)	$ (8,781)	$ (12,057)
State taxes	609	(246)	(356)
Foreign dividends and unremitted earnings	1,493	(586)	1,938
Valuation allowance	2,456	7,367	26,662
Taxes on foreign income that differ from U.S. tax rate	(405)	2,488	(2,314)
Tax credits	433	0	(252)
Non-deductible stock-based compensation expense	1,104	1,206	1,596
Earnout liability fair value adjustment	(2)	(43)	(596)
Uncertain tax positions	435	362	530
Other	145	725	(196)
Total income tax provision	$ 1,742	$ 2,492	$ 14,955
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal tax (benefit) rate	35.00%	35.00%	35.00%
State taxes	(4.70%)	1.00%	1.00%
Foreign dividends and unremitted earnings	(11.50%)	2.30%	(5.60%)
Valuation allowance	(18.60%)	(29.40%)	(77.40%)
Taxes on foreign income that differ from U.S. tax rate	3.10%	(9.90%)	6.70%
Tax credits	(3.30%)	(0.00%)	0.70%
Non-deductible stock-based compensation expense	(8.50%)	(4.80%)	(4.60%)
Earnout liability fair value adjustment	0.00%	0.20%	1.70%
Uncertain tax positions	(3.40%)	(1.40%)	(1.50%)
Other	(1.60%)	(2.90%)	0.60%
Effective tax rate	(13.50%)	(9.90%)	(43.40%)