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Stockholders' Equity - Activities Under Equity Plan (Details)	9 Months Ended
	Sep. 30, 2021 shares
2012 Equity Plan
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]
Issuance of common stock in lieu of cash compensation (in shares)	(169,944)
ESPP
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]
Shares available for grant (in shares)	149,199
ESPP common stock purchased by eligible employees (in shares)	(16,015)
Shares available for grant (in shares)	133,184
Unvested RSUs, DSUs and Restricted Stock
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]
RSU, DSU, and restricted stock awarded to eligible employees (in shares)	(644,339)
Unvested RSUs, DSUs and Restricted Stock | 2012 Equity Plan
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]
Shares available for grant (in shares)	1,699,314
RSU, DSU, and restricted stock awarded to eligible employees (in shares)	(508,889)
Issuance of common stock in lieu of cash compensation (in shares)	(169,944)
Shares available for grant (in shares)	1,020,481

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Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares issued under share-based payment arrangement.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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