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Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets and liabilities [Abstract] |  |
Accruals and prepaids | $ 4,606 | $ 3,563
Intangible assets | 146 | 619
Property and equipment | (1,396) | (770)
R&D and other tax credits | 3,293 | 2,086
Stock compensation | 7,063 | 4,163
Charitable contributions | 0 | 1
Federal and state basis difference | 145 | 114
Net operating loss | 1,763 | 6,382
Net deferred tax assets | 15,620 | 16,158
Valuation allowance | (782) | (16,158)
Deferred tax assets and liabilities, net of valuation allowance | $ 14,838 | $ 0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible charitable contribution carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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