Income Taxes - Textual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
U.S. federal income tax rate, percent	21.00%	21.00%	35.00%
Deferred tax assets, valuation allowance	$ 14,160	$ 3,172
Maximum amount company recognize from unrecognized tax benefit	15,143	5,528	$ 4,880	$ 4,827
Unrecognized tax benefits that would reflect as adjustment to income tax expense if recognized	10,649	4,995
Unrecognized tax benefits, income tax penalties and interest expense	236	199	$ 246
Unrecognized tax benefits, income tax penalties and interest accrued	1,681	$ 1,445
California [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance	7,439
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance foreign tax credit	2,366
Operating loss carryforwards	20,986
Research and development tax credit carryforward	$ 2,366
Foreign [Member] | Research and Development Credit [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward expiration date	Dec. 31, 2029
Foreign [Member] | China [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance foreign tax credit	$ 478
Foreign [Member] | Switzerland [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance foreign tax credit	3,434
Foreign [Member] | United Kingdom [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance foreign tax credit	443
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,997
Research and development tax credit carryforward	6,859
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	25,630
Research and development tax credit carryforward	$ 9,948