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Convertible Notes - Additional Information (Details)					1 Months Ended	6 Months Ended					12 Months Ended
	Oct. 04, 2018 USD ($)	Feb. 18, 2018	Feb. 17, 2018	Mar. 14, 2016 USD ($) $ / shares	Oct. 31, 2018 USD ($) $ / shares	Aug. 31, 2018 USD ($)	Feb. 28, 2018 USD ($) $ / shares	Aug. 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Aug. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) shares $ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Convertible Notes
Interest Expense											$ 582,000	$ 927,000	$ 687,000
Senior Secured Convertible Notes due August 15 2018
Convertible Notes
Stated interest rate (as a percent)				10.00%	8.00%		8.00%
Principal amount				$ 8,000,000
Payment on principle amount of note	$ 7,400,000				$ 7,400,000
Redemption purchase price (as a percent)		100.00%	120.00%
Minimum ownership percentage triggering event for redemption of notes				40.00%
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments				$ 5,000,000
Senior Secured Convertible Notes due August 15 2018 | Contractual obligations and other termination costs
Convertible Notes
Debt issuance costs				$ 100,000
Interest Expense											30,000	$ 45,000	$ 37,000
Senior Secured Convertible Notes due August 15 2018 | Minimum
Convertible Notes
Percentage of beneficial ownership if effective upon conversion date of debt instrument				19.90%
Senior Secured Convertible Notes due August 15 2018 | Maximum
Convertible Notes
Period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts (in days)				90 days
Senior Secured Convertible Notes due August 15, 2023
Convertible Notes
Conversion price (in dollars per share) | $ / shares				$ 8.50	$ 0.5717		$ 0.5717
Outstanding Notes payable											$ 2,700,000
Interest Note
Convertible Notes
Conversion price (in dollars per share) | $ / shares											$ 0.5717
Number of shares issuable if notes converted to shares of common stock | shares											4,671,424
Semi-annual interest payments						$ 383,000	$ 463,000	$ 434,000	$ 420,000	$ 336,000

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The percentage of beneficial ownership if effective upon the applicable conversion date of debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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