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Debt (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 15, 2018 | May 31, 2018 | Aug. 31, 2019 | May 31, 2018 | Oct. 31, 2016 | Dec. 31, 2020 | Dec. 31, 2018
Debt Instrument |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  | $ 13,374,000 | $ 12,993,000
Outstanding borrowings |  |  |  |  |  | 236,288,000 |
Outstanding warrants to purchase common stock |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Total fair value of warrants |  |  |  | $ 1,400,000 |  |  |
CRG Loan |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 45,000,000.0 |  |  | $ 80,000,000.0 |  |
Loss on early extinguishment of debt | $ 13,000,000.0 |  |  |  |  |  |
CRG Loan | Outstanding warrants to purchase common stock |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Warrant exercise price (in USD per share) |  | $ 23.00 |  | $ 23.00 |  |  |
CRG Loan | Outstanding warrants to purchase common stock | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Shares of common stock right to purchase by warrant (in shares) |  | 200,000 |  | 200,000 |  |  |
Line of Credit Agreement |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 50,000,000.0 |  |  | 50,000,000.0 |
Basis for variable rate |  |  | 5.50% |  |  |  |
Debt termination fee |  |  | $ 1,000,000.0 |  |  |  |
Payment of initial commitment fee |  |  | 150,000 |  |  |  |
Additional commitment fees payable each of the first and second anniversaries of the closing date |  |  | $ 150,000 |  |  |  |
Outstanding borrowings |  |  |  |  |  | $ 0 |
Line of Credit Agreement | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Borrowing option - percentage of eligible accounts receivable |  |  | 85.00% |  |  | 85.00% |
Convertible Debt | Convertible Notes |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Convertible Notes initially issued | $ 210,000,000.0 |  |  |  |  |  |

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- Definition Represents the borrowing option amount as a percentage of eligible accounts receivable, less certain reserves. + References No definition available. + Details
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- Definition The amount of additional commitment fee payable on first and second anniversaries of the closing date, or upon earlier termination of, or default under the agreement. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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