Annual report pursuant to Section 13 and 15(d)

Income Taxes - NOL Carryforwards and Federal Research and Development Tax Credits (Details)

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Income Taxes - NOL Carryforwards and Federal Research and Development Tax Credits (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Domestic Tax Authority  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Net operating losses, amount $ 224,476
Net operating losses, not subject to expiration, amount 64,371
Tax credits, amount 9,031
State  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Net operating losses, amount 124,881
Tax credits, amount 10,436
Foreign Tax Authority  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Net operating losses, amount $ 536