Amount of deferred tax consequences attributable to convertible debt.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Summary of significant accounting policies - Adoption of ASU 2020-06 (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Stockholders equity	$ 104,926	$ 196,577	$ 481,982	$ 510,954	$ 572,494	$ 594,330
Long-term debt	281,604		309,145
Cumulative Effect Adjustment
Stockholders equity			(120,440)
Long-term debt			120,400
Deferred tax liability - convertible debt			(29,600)
Deferred tax valuation allowance			29,600
Additional paid-in capital
Stockholders equity	2,092,534	2,063,687	2,171,746	2,101,136	2,067,274	1,795,351
Additional paid-in capital \| Cumulative Effect Adjustment
Stockholders equity			(175,236)
Accumulated deficit
Stockholders equity	$ (1,954,717)	$ (1,821,093)	(1,628,877)	$ (1,554,523)	$ (1,484,831)	$ (1,190,499)
Accumulated deficit \| Cumulative Effect Adjustment
Stockholders equity			$ 54,796