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Stockholder's Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Nov. 21, 2017	Mar. 31, 2019	Dec. 31, 2018	Nov. 21, 2018	Feb. 12, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		10,000,000	10,000,000		10,000,000
Preferred stock, par value (in dollars per share)		$ 0.00001	$ 0.00001		$ 0.00001
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Common stock, shares authorized (in shares)		100,000,000	100,000,000		100,000,000
Common stock, par value (in dollars per share)		$ 0.00001	$ 0.00001		$ 0.00001
Common stock, shares, issued (in shares)		27,285,363	27,274,991
Common stock, shares, outstanding (in shares)		27,285,363	27,274,991
Maximum number of shares authorized under the plan (in shares)	4,361,291
Annual increase percentage of maximum shares outstanding (equal to)	4.00%
Additional capital shares reserved for future issuance (in shares)				1,091,000
Capital shares reserved for future issuance (in shares)		1,283,193
Contractual term		10 years
Capitalized compensation expense		$ 17,000
Minimum
Class of Stock [Line Items]
Award vesting period		2 years
Maximum
Class of Stock [Line Items]
Award vesting period		4 years

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