Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 25
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=123466103&loc=SL6014347-161799

Convertible Senior Notes (Details)	2 Months Ended	3 Months Ended		9 Months Ended
Convertible Senior Notes (Details)	Oct. 31, 2020 USD ($) day $ / shares	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Net proceeds from issuance of convertible senior notes				$ 0	$ 194,000,000
Equity component of convertible senior notes			$ 65,482,000
Stock price (in usd per share) \| $ / shares		$ 15.19		$ 15.19
The Notes \| Convertible Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 230,000,000
Stated interest rate (percent)	2.75%
Net proceeds from issuance of convertible senior notes	$ 222,500,000
Conversion ratio				0.0411794
Conversion price (in usd per share) \| $ / shares	$ 24.28
Multiples of principle amount available as optional conversion to holders	$ 1,000
Liability component allocation of issuance	152,100,000
Carrying amount of equity component	77,900,000
Issuance costs incurred	7,500,000
Debt issuance costs attributable to the liability component	4,900,000
Debt issuance costs attributable to the equity component	2,600,000
Equity component of convertible senior notes	$ 75,300,000
Effective interest rate (percent)		9.90%		9.90%
Unamortized debt discount and issuance costs		$ 74,129,000		$ 74,129,000		$ 80,647,000
Amortization period of unamortized issuance costs				6 years
Total interest expense		3,819,000		$ 11,295,000
Borrowings		$ 155,871,000		$ 155,871,000		$ 149,353,000
The Notes \| Convertible Notes \| Conversion circumstance, one
Debt Instrument [Line Items]
Conversion price threshold (percent)	130.00%
Conversion threshold in days \| day	20
Conversion threshold in consecutive days \| day	30
The Notes \| Convertible Notes \| Conversion circumstance, two
Debt Instrument [Line Items]
Conversion price threshold (percent)	98.00%
Conversion threshold in days \| day	5
Conversion threshold in consecutive days \| day	10
The Notes \| Convertible Notes \| Conversion circumstance, three
Debt Instrument [Line Items]
Conversion price threshold (percent)	130.00%	130.00%
Conversion threshold in days \| day	20
Conversion threshold in consecutive days \| day	30
Redemption price percentage of principal (percent)	100.00%