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Stock-based Compensation - Stock Option (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Additional disclosures
Proceeds resulting from exercise of stock options	$ 1,900,000
Stock options
Stock-based compensation expense
Shares available for future issuance	1,225,595
Shares
Outstanding at the beginning of the period (in shares)	976,777
Options granted (in shares)	241,650
Options exercised (in shares)	(86,095)
Options canceled (in shares)	(8,750)
Outstanding at the end of the period (in shares)	1,123,582
Exercisable at the end of the period (in shares)	621,000
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 11.97
Options granted (in dollars per share)	173.23
Options exercised (in dollars per share)	22.06
Options cancelled (in dollars per share)	113.81
Outstanding at the end of the period (in dollars per share)	45.09
Exercisable at the end of the period (in dollars per share)	$ 10.75
Additional disclosures
Proceeds resulting from exercise of stock options	$ 1,900,000	$ 0
Weighted-average grant date fair value of options (in dollars per share)	$ 136.43	$ 13.30
Stock options | Maximum
Stock-based compensation expense
Expiration period	10 years

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