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Stockholders' Equity - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended
	May 31, 2018	Mar. 31, 2019	May 13, 2016
2016 Incentive Plan
Class of Stock [Line Items]
Number of shares authorized (shares)		10,000,000	16,000,000
Number of potential shares authorized for issuance under share based compensation plan (shares)			2,000,000
Number of shares available for grant (shares)		1,957,458
Number of shares of unvested restricted stock units and options outstanding (shares)		1,713,462
Common stock, other shares, outstanding (shares)		5,376,353
Award vesting period		3 years
Maximum contractual term		10 years
2007 Incentive Plan
Class of Stock [Line Items]
Common stock, other shares, outstanding (shares)		5,651,247
Award vesting period		3 years
Maximum contractual term		10 years
Number of shares of unvested restricted stock units (shares)		6,666
Common Stock | Sales Agreement
Class of Stock [Line Items]
Maximum authorized amount	$ 100,000,000.0
Agent fee	3.00%
Aggregate number of shares issued (shares)		183,200
Common shares sold (dollars per share)		$ 5.05
Aggregate proceeds		$ 907,000
Stock sales agreement, remaining authorized sales amount		$ 71,100,000

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