Stock-Based Compensation - Stock Option Awards Outstanding Rollforward (Details)	12 Months Ended
Dec. 31, 2019 $ / shares shares
Number of Stock Option Awards Outstanding
Stock option awards outstanding, beginning balance (shares) \| shares	6,348,251
Stock option awards granted (shares) \| shares	884,479
Stock option awards forfeited (shares) \| shares	(215,813)
Stock option awards exercised (shares) \| shares	(1,689,161)
Stock option awards outstanding, ending balance (shares) \| shares	5,327,756
Stock option awards vested and exercisable (shares) \| shares	3,593,624
Weighted Average Exercise Price Per Share
Stock option awards outstanding, beginning balance (usd per share) \| $ / shares	$ 3.73
Stock option awards granted (usd per share) \| $ / shares	6.06
Stock option awards forfeited (usd per share) \| $ / shares	4.33
Stock option awards exercised (usd per share) \| $ / shares	4.05
Stock option awards outstanding, ending balance (usd per share) \| $ / shares	4.00
Stock option awards vested and exercisable (usd per share) \| $ / shares	$ 4.00
Stock option awards outside of equity compensation plan
Stock-Based Compensation
Cliff period	1 year
Stock option awards outside of equity compensation plan \| Maximum
Stock-Based Compensation
Vesting period (years)	4 years
Expiration period (years)	10 years

Represents the cliff vesting period for stock options.

No definition available.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.