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Stockholders' Equity - Summary of Stock Option Activity (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Equity [Abstract]
Number of shares outstanding (in shares)	15,265,000
Number of shares granted (in shares)	985,000
Number of shares exercised (in shares)	(1,793,000)
Expired and forfeited (in shares)	(1,378,000)
Number of shares outstanding (in shares)	13,079,000	15,265,000
Number of shares outstanding, weighted average exercise price (in dollars per share)	$ 18.33
Number of shares granted, weighted average exercise price (in dollars per share)	21.18
Number of shares exercised, weighted average exercise price (in dollars per share)	11.29
Number of shares expired and forfeited, weighted average exercise price (in dollars per share)	22.65
Number of shares outstanding, weighted average exercise price (in dollars per share)	$ 19.06	$ 18.33
Number of shares outstanding, weighted average remaining contractual term (Year)	7 years 4 months 2 days	6 years 10 months 13 days

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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