Common Stock (Narrative) (Details) $ / shares in Units, $ in Thousands					3 Months Ended	9 Months Ended
	Mar. 29, 2017 USD ($) $ / shares shares	Mar. 15, 2017 USD ($) shares	Feb. 28, 2017 $ / shares shares	Jan. 24, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 20, 2017 USD ($)
Class of Stock [Line Items]
Warrant issuance costs | $						$ 289	$ 12
Reverse stock split, conversion ratio		0.1538
Reverse stock split, fractional shares issued		0
Reverse stock split, shares settled in cash		73
Reverse stock split, shares settled in cash, amount | $		$ 1				1
Proceeds from common stock issued | $						45,879
Issuance costs | $						$ 1,190
Underwritten Public Offering [Member]
Class of Stock [Line Items]
Shares issued, price per share | $ / shares	$ 10.50
Issuance of common stock, shares	4,772,500
Proceeds from common stock issued | $	$ 45,888
ATM Program [Member]
Class of Stock [Line Items]
Shares issued, price per share | $ / shares					$ 10.50	$ 10.50
Issuance of common stock, shares					5,950
Proceeds from common stock issued | $					$ 62
Equity distribution agreement, commission fee, percent					2.00%
Issuance costs | $					$ 61
Maximum [Member] | ATM Program [Member]
Class of Stock [Line Items]
Equity distribution agreement, aggregate price of shares available for sale | $								$ 50,000
Pursuant To Full Exercise Of An Option To Purchase Additional Shares Of Common Stock Granted To Underwriters [Member] | Underwritten Public Offering [Member]
Class of Stock [Line Items]
Issuance of common stock, shares	622,500
New Warrants [Member]
Class of Stock [Line Items]
Shares issued upon conversion				23,160
Common stock warrants, exercise price | $ / shares				$ 0.0065
Warrant expiration				Jan. 24, 2019
Warrants [Member]
Class of Stock [Line Items]
Warrant issuance costs | $				$ 289
Real Estate Strategies, L.P. [Member] | Warrants [Member]
Class of Stock [Line Items]
Shares converted				576,923
Common Stock [Member]
Class of Stock [Line Items]
Shares issued upon conversion			6,004,957
Number of shares called by warrant				23,160
Shares issued, price per share | $ / shares			$ 10.40
Issuance of common stock, shares						4,801,000