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Debt Facilities - Convertible Senior Notes - Additional Information (Details)
1 Months Ended 3 Months Ended
Dec. 11, 2019
$ / shares
Dec. 31, 2019
USD ($)
d
$ / shares
shares
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Debt instrument, threshold trading days | d   5  
Number of business day | d   5  
Payment for capped call transactions   $ 10,100,000  
2019 Convertible Senior Notes due 2026      
Debt Instrument [Line Items]      
Aggregate principal amount   $ 86,300,000  
Debt instrument, Interest rate   2.00%  
Debt instrument, maturity date   Dec. 15, 2026  
Debt Instrument, frequency of periodic payment     The 2019 Notes bear interest at a fixed rate of 2.00% per year, payable semiannually in arrears on June 15 and December 15 of each year, beginning June 15, 2020.
Net proceeds from issuing notes   $ 83,500,000  
Debt instrument convertible common stock conversion shares per 1000 principal amount of notes | shares   28.9415  
Debt instrument, initial conversion ratio   0.0289415  
Debt instrument, initial conversion price | $ / shares   $ 34.55  
Debt instrument, threshold consecutive trading days | d   30  
Debt instrument, threshold percentage of stock price trigger   130.00%  
Debt instrument, terms of conversion feature     On or after September 15, 2026, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of the 2019 Notes, in multiples of $1,000 principal amount, at the option of the holder regardless of the foregoing circumstances.
Percentage of repurchase price of principal amount   100.00%  
Debt instrument, borrowing interest rate percentage   9.90%  
Fair value of liability component upon issuance   $ 52,500,000  
Initial carrying amount of liability component recognized as debt discount   33,800,000  
Proceeds from convertible debt   86,300,000  
Adjustments recorded in additional paid-in capital   33,800,000  
Total issuance cost allocated between liability and equity   2,800,000  
Liability issuance costs   1,700,000  
Equity issuance costs   $ 1,100,000  
Effective interest rate on the liability component   10.21%  
Accrued interest     $ 503,000
Cap price of the capped call transactions | $ / shares   $ 54.20  
Premium percentage on sale price of common stock 100.00%    
Common stock sale price per share last reported | $ / shares $ 27.10    
Capped call transactions expiration consecutive days | d   40  
Capped call transaction expiring date Dec. 11, 2026    
2019 Convertible Senior Notes due 2026 | Level 2      
Debt Instrument [Line Items]      
Estimated fair value   $ 87,000,000 $ 73,600,000
2019 Convertible Senior Notes due 2026 | Minimum      
Debt Instrument [Line Items]      
Debt instrument, threshold trading days | d   20  
2019 Convertible Senior Notes due 2026 | Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument, threshold percentage of stock price trigger   98.00%