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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	6 Months Ended
	Jul. 08, 2018	Aug. 06, 2018	Jun. 30, 2018
Restricted Stock Units (RSUs) [Member]
Stock Transactions [Abstract]
New shares of common stock issued as a result of vesting RSUs (in shares)			168,219
ATM Agreement [Member] | Common Stock [Member]
Stock Transactions [Abstract]
Number of shares of common stock sold (in shares)			3,072,610
Average sales price per common share (in dollars per share)			$ 3.91
Aggregate proceeds from sales of common stock			$ 12,000
Sales commissions, fees and other costs associated with issuance of common stock			$ 360
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Stock Transactions [Abstract]
New shares of common stock issued as a result of vesting RSUs (in shares)	31,865
Subsequent Event [Member] | ATM Agreement [Member] | Common Stock [Member]
Stock Transactions [Abstract]
Number of shares of common stock sold (in shares)		297,652
Average sales price per common share (in dollars per share)		$ 3.48
Aggregate proceeds from sales of common stock		$ 1,036
Sales commissions, fees and other costs associated with issuance of common stock		$ 31

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