Stockholders' Equity (Deficit) (Details)	1 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($) shares	Oct. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) Vote	Dec. 31, 2015 USD ($)
Stockholders' Equity (Deficit)
Number of votes per share that common stockholders are entitled to receive | Vote			1
Value of shares sold by the entity			$ 5,953,832
Net proceeds after deducting commissions and other transactions costs			5,953,832	$ 6
At-The-Market Issuance Sales Agreement
Stockholders' Equity (Deficit)
Number of shares sold by the entity | shares	381,717
Value of shares sold by the entity	$ 6,100,000
Net proceeds after deducting commissions and other transactions costs	6,000,000
Remaining reserved amount under shelf registration	$ 93,900,000		$ 93,900,000
Cowen & Co. LLC | At-The-Market Issuance Sales Agreement
Stockholders' Equity (Deficit)
Maximum aggregate offering price		$ 100,000,000
Notice period of termination of sales agreement		10 days
Cowen & Co. LLC | Maximum | At-The-Market Issuance Sales Agreement
Stockholders' Equity (Deficit)
Percentage of gross proceeds payable as commission		3.00%