Information About Geographic Areas - Long-lived Assets by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 16,525				$ 15,258				$ 16,525	$ 15,258	$ 13,889
Total revenue	25,084	$ 22,191	$ 28,168	$ 29,003	30,722	$ 28,643	$ 28,618	$ 26,729	104,446	114,712	116,456
United States
Segment Reporting Information [Line Items]
Total property and equipment, net	6,145				6,123				6,145	6,123	5,317
Singapore
Segment Reporting Information [Line Items]
Total property and equipment, net	6,830				8,014				6,830	8,014	7,624
Canada
Segment Reporting Information [Line Items]
Total property and equipment, net	3,503				1,065				3,503	1,065	837
Europe
Segment Reporting Information [Line Items]
Total property and equipment, net	43				47				43	47	75
Asia-Pacific
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 4				$ 9				$ 4	$ 9	$ 36
Sales Revenue, Net [Member] | China
Segment Reporting Information [Line Items]
Concentration risk									11.00%
Total revenue									$ 11,100