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Stockholders' Equity - Narrative (Details) - USD ($)			1 Months Ended	3 Months Ended		5 Months Ended	9 Months Ended		24 Months Ended
	Jan. 01, 2018	Jul. 25, 2017	May 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 05, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 05, 2018	May 13, 2016
Class of Stock [Line Items]
Proceeds from issuance of stock							$ 14,923,263	$ 94,347,922
Warrants exercised (shares)				284,091	0		284,091	0
Proceeds from warrant exercises				$ 902,000			$ 902,000
Number of warrants outstanding (shares)				0			0
Award vesting period							3 years
Maximum contractual term							10 years
Stock and Cash Based Incentive Plan
Class of Stock [Line Items]
Common stock, other shares, outstanding (shares)				5,840,878			5,840,878
Award vesting period							3 years
Maximum contractual term							10 years
Number of shares of unvested restricted stock units (shares)							176,330
2016 Incentive Plan
Class of Stock [Line Items]
Number of shares authorized (shares)				8,000,000			8,000,000			6,000,000
Number of potential shares authorized for issuance under share based compensation plan (shares)										2,000,000
Increase in number of shares authorized, share-based compensation arrangement (shares)	2,000,000
Number of shares available for grant (shares)				2,993,654			2,993,654
Number of shares of unvested restricted stock units and options outstanding (shares)				1,534,883			1,534,883
Common stock, other shares, outstanding (shares)				3,104,397			3,104,397
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)							2,652,530
Common shares sold (dollars per share)				$ 5.14			$ 5.14
Aggregate proceeds							$ 13,400,000
Remaining authorized amount				$ 86,400,000			86,400,000
Proceeds from issuance of stock							$ 14,900,000
Common Stock | ATM Sales Agreement
Class of Stock [Line Items]
Aggregate number of shares issued (shares)						314,950		2,937,406	3,911,104
Common shares sold (dollars per share)					$ 8.41	$ 5.07		$ 8.41	$ 5.07
Aggregate proceeds						$ 1,600,000		$ 24,200,000	$ 32,100,000
Common Stock | Public Offering, Not IPO
Class of Stock [Line Items]
Common shares sold (dollars per share)		$ 6.00
Number of common shares sold (shares)		12,500,000
Proceeds from issuance of stock		$ 70,100,000

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