Annual report pursuant to Section 13 and 15(d)

Income Taxes - Tax Rate Reconciliation (Details)

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Income Taxes - Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Rate Reconciliation      
Tax benefit at federal statutory rate $ (2,693) $ (6,571) $ (14,073)
State taxes 1,126 249 (1,948)
Research and development credits (85) (57) (195)
Foreign operations taxed at different rates 31 447 (108)
Stock-based compensation 77 (2) 117
Other nondeductible items (43) (364) (1,272)
Change in valuation allowance 1,249 6,042 17,392
Total provision for income taxes $ (338) $ (256) $ (87)