Equity - Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
Jul. 18, 2016	Sep. 30, 2017
Fair value assumptions
Time to maturity		3 years 10 months 17 days
Volatility rate		60.00%
Risk-free interest rate		1.77%
SWIMS
Class of Warrant or Right [Line Items]
Fair value of warrants issued	$ 45
Exercise price (in dollars per share)	$ 5.47
Warrants \| SWIMS
Class of Warrant or Right [Line Items]
Shares of common stock	150,000
Fair value of warrants issued	$ 45
Exercise price (in dollars per share)	$ 5.47
Fair value assumptions
Time to maturity	3 years
Volatility rate	45.00%
Dividend rate	0.00%
Risk-free interest rate	0.85%
Discount rate	10.00%
Restriction period	6 months
Warrants \| Tengram Capital Partners, LP
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)	$ 3.00
Warrants \| Tengram Capital Partners, LP \| SWIMS
Class of Warrant or Right [Line Items]
Shares of common stock	500,000
Fair value of warrants issued	$ 465
Exercise price (in dollars per share)	$ 3.00
Fair value assumptions
Time to maturity	5 years
Volatility rate	50.00%
Dividend rate	0.00%
Risk-free interest rate	1.14%
Discount rate	20.00%
Restriction period	6 years

Restriction period assigned for lack of marketability.

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Exercise price per share or per unit of warrants or rights outstanding.

+ 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)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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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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Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ 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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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