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Common Stock (Details) - $ / shares	Nov. 11, 2013	Aug. 29, 2013	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			400,000,000	400,000,000
Common stock, par value (in dollars per share)			$ 0.001	$ 0.001
Outstanding stock options			627,317	1,611,385
Total common shares reserved for future issuance			43,289,612
2013 Plan
Class of Stock [Line Items]
Shares available for grant under the 2013 Plan			29,158,085
Total common shares reserved for future issuance	12,000,000
Award exercise price as percent of fair market value of common stock on grant date threshold	100.00%
Expiration period	10 years
2005 Stock Incentive Plan
Class of Stock [Line Items]
Total common shares reserved for future issuance	3,838,985
2013 Employee Stock Purchase Plan
Class of Stock [Line Items]
Total common shares reserved for future issuance			8,688,210
Maximum employee subscription rate		15.00%
Employee discount on applicable offering period		15.00%
Offering period (no more than 6 months)		6 months
Shares reserved		4,000,000
Maximum aggregate number of shares to be issued		20,000,000
RSUs and PSUs
Class of Stock [Line Items]
Outstanding RSUs and PSUs			4,816,000	6,909,530

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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