Segment Information Geographical Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 32,292	$ 28,773	$ 35,093	$ 37,610	$ 55,397	$ 61,288	$ 55,146	$ 40,561	$ 133,768	$ 212,392	$ 184,593
Property and equipment, net	6,713								4,728	6,713
Total intangible assets, net	17,575								6,862	17,575
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									59,133	129,562	81,933
Property and equipment, net	4,566								2,974	4,566
Total intangible assets, net	17,575								6,862	17,575
Other North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,014	219	631
Property and equipment, net	129								33	129
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									10,041	12,129	28,819
Property and equipment, net	438								163	438
Other Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									18,363	25,392	41,836
Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									74,635	82,830	102,660
Property and equipment, net	2,147								1,754	2,147
Total Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									28,404	37,521	70,655
Property and equipment, net	2,018								1,721	2,018
Netherlands
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									28,124	31,525	14,642
Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									17,093	13,565	16,732
Total EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									45,217	45,090	$ 31,374
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 1,580								$ 1,558	$ 1,580