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Income Taxes - Significant Components of Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Net operating loss carryforwards $ 66,400 $ 53,259
Deferred revenue 8 70
Lease liability 923 0
Stock-based compensation 5,805 4,788
Tax credits 3,687 3,696
Other 1,473 682
Total deferred tax assets 78,296 62,495
Deferred tax liabilities:    
Intangible assets 7,559 8,207
Right-of-use assets 841 0
Total deferred tax liabilities 8,400 8,207
Deferred tax assets, net 69,896 54,288
Valuation allowance 69,896 54,288
Total deferred tax liability $ 0 $ 0