Warrants (Details) - Warrant [Member] - Level 3 [Member] - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value Assumptions [Abstract]
Number of shares underlying the warrants (in shares)	403,090		403,090
Stock price (in dollars per share)	$ 1.77		$ 2.20
Volatility	48.00%		47.00%
Risk-free interest rate			1.22%
Expected dividend yield	0.00%		0.00%
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period	$ 105	$ 7,042	$ 7,042
Decrease in Fair Value	(77)	(5,316)
Reclassification to Equity		(1,541)
Balance as end of period	$ 28	185	$ 105
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]
Number of warrants to purchase common stock (in shares)	403,090
Minimum [Member]
Fair Value Assumptions [Abstract]
Risk-free interest rate	1.31%
Expected warrant life	1 year 4 months 13 days		2 years 1 month 13 days
Maximum [Member]
Fair Value Assumptions [Abstract]
Risk-free interest rate	1.45%
Expected warrant life	1 year 7 months 6 days		2 years 4 months 6 days
10/31/2013 [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period	$ 39	379	$ 379
Decrease in Fair Value	(28)	(312)
Reclassification to Equity		0
Balance as end of period	$ 11	67	39
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]
Number of warrants to purchase common stock (in shares)	137,143
2/5/2014 [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period	$ 66	715	715
Decrease in Fair Value	(49)	(597)
Reclassification to Equity		0
Balance as end of period	$ 17	118	66
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]
Number of warrants to purchase common stock (in shares)	265,947
7/24/2014 Series A [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period		2,415	2,415
Decrease in Fair Value		(1,573)
Reclassification to Equity		(842)
Balance as end of period		0
7/24/2014 Series B [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period		1,726	1,726
Decrease in Fair Value		(1,713)
Reclassification to Equity		(13)
Balance as end of period		0
6/22/2015 [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period		1,807	$ 1,807
Decrease in Fair Value		(1,121)
Reclassification to Equity		(686)
Balance as end of period		$ 0

Refers to the Reclassification to equity of fair value measurements using significant unobservable inputs.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
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- Definition

The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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- Definition

Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Price of a single share of a number of saleable stocks of a company.

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