Debt - Capitalization (Details) - USD ($)		12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Extinguishment of debt	$ 11,562,000
Proceeds from issuance of debt	2,200,000
Payment of debt extinguishment or debt repayment with cash on hand	$ 350,000
Gain on extinguishment of debt		$ 9,045,000	$ 0
Write-off of debt discount		$ 89,000
Treasury stock shares acquired net of reissued (in shares)	404,587
Treasury stock acquired, net of reissued	$ 121,376
Promissory Note | SRS Note
Debt Instrument [Line Items]
Extinguishment of debt	$ 2,562,000
Share price (in dollars per share)	$ 0.30