Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Program revenue	$ 39,690	$ 33,930	$ 30,624
Licensing and royalty revenue	7,608	11,392	17,071
Total revenue	47,298	45,322	47,695
Cost of revenue:
Cost of program revenue	15,705	18,965	24,358
Cost of licensing and royalty revenue	125	339	293
Total cost of revenue	15,830	19,304	24,651
Gross profit	31,468	26,018	23,044
Operating expenses:
Research and development	28,126	28,576	24,320
Sales and marketing	7,383	5,881	5,770
General and administrative	10,713	12,287	12,636
Restructuring charges	1,114		1,361
Total operating expenses	47,336	46,744	44,087
Loss from operations	(15,868)	(20,726)	(21,043)
Other income (expense):
Interest income (expense), net	173	(267)	(682)
Other income (expense), net	265	(12)	(29)
Total other income (expense), net	438	(279)	(711)
Loss before provision for income taxes	(15,430)	(21,005)	(21,754)
Provision for income taxes	7	8	7
Net loss	$ (15,437)	$ (21,013)	$ (21,761)
Net loss per share, basic and diluted	$ (0.31)	$ (0.44)	$ (0.47)
Weighted-average number of shares used in computing net loss per share, basic and diluted	49,395,635	48,158,378	46,718,495
Related Party Transactions.
Revenue:
Program revenue	$ 267	$ 35	$ 1,114
Licensing and royalty revenue	1,741	3,279	4,480
Total revenue	2,008	$ 3,314	$ 5,594
Cost of revenue:
Cost of program revenue	102
Cost of licensing and royalty revenue	29
Total cost of revenue	$ 131