Debt Obligations - Additional Information (Details) - 1.75% Convertible Senior Notes Due 2022 - Senior Notes	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2017 USD ($) d $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Debt instrument aggregate principal amount	$ 200,000,000.0
Debt instrument fixed interest rate per annum	1.75%
Net proceeds from the debt offering, after deducting transaction costs	$ 193,800,000
Convertible notes, conversion ratio	0.0576037
Convertible notes, initial conversion price (in USD per share) | $ / shares	$ 17.36
Convertible notes, percentage of conversion price	130.00%
Convertible notes, sinking fund	$ 0
Convertible notes, redemption percentage	100.00%
Carrying amount of the liability component	$ 149,300,000
Carrying amount of the equity component	$ 50,700,000
Convertible notes, effective interest rate	5.80%
Debt issuance costs	$ 6,200,000
Amortization of interest expense	4,600,000	$ 231,000	$ 230,000	$ 693,000	$ 690,000
Adjustments to additional paid in capital, equity component of debt issuance costs	$ 1,600,000	1,600,000		1,600,000		$ 1,600,000
Additional Paid-In Capital
Line of Credit Facility [Line Items]
Carrying amount of the equity component		$ 49,100,000		$ 49,100,000		$ 49,100,000
130% Applicable Conversion Price
Line of Credit Facility [Line Items]
Convertible notes, consecutive trading days | d	20
Convertible notes, threshold consecutive trading days | d	30
90% Applicable Conversion Price
Line of Credit Facility [Line Items]
Convertible notes, consecutive trading days | d	5
Convertible notes, threshold consecutive trading days | d	5
Maximum
Line of Credit Facility [Line Items]
Convertible notes, percentage of last reported sale price of common stock	98.00%