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Stockholders' Equity (Deficit) (Details) $ / shares in Units, $ in Millions	1 Months Ended		6 Months Ended	21 Months Ended
	Jun. 30, 2017 USD ($) Vote $ / shares shares	Oct. 31, 2015 USD ($)	Jun. 30, 2017 USD ($) Vote $ / shares shares	Jun. 30, 2017 USD ($) Vote $ / shares shares	Dec. 31, 2016 $ / shares
Stockholders' Equity (Deficit)
Number of votes per share that common stockholders are entitled to receive | Vote			1
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.0001		$ 0.0001	$ 0.0001	$ 0.0001
At-The-Market Issuance Sales Agreement
Stockholders' Equity (Deficit)
Number of shares sold by the entity | shares			215,539	597,256
Value of shares sold by the entity			$ 3.5	$ 9.6
Net proceeds after deducting commissions and other transactions costs			3.4	9.4
Remaining reserved amount under shelf registration	$ 90.4		$ 90.4	$ 90.4
Cowen & Co. LLC | At-The-Market Issuance Sales Agreement
Stockholders' Equity (Deficit)
Maximum aggregate offering price		$ 100.0
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%
Series A Convertible Preferred Stock
Stockholders' Equity (Deficit)
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock conversion ratio | shares	1
Preferred shares number voting rights | Vote	0		0	0
Private Placement Offering | Purchase Agreement
Stockholders' Equity (Deficit)
Value of shares sold by the entity	$ 35.0
Net proceeds after deducting commissions and other transactions costs	$ 34.9
Private Placement Offering | Common stock | Purchase Agreement
Stockholders' Equity (Deficit)
Number of shares sold by the entity | shares	328,300
Issue price of stock | $ / shares	$ 15.23		$ 15.23	$ 15.23
Private Placement Offering | Series A Convertible Preferred Stock | Purchase Agreement
Stockholders' Equity (Deficit)
Number of shares sold by the entity | shares	1,969,797
Issue price of stock | $ / shares	$ 15.23		$ 15.23	$ 15.23

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