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Convertible Notes - Additional Information (Details)						3 Months Ended		6 Months Ended					9 Months Ended
	Oct. 04, 2018 USD ($)	Oct. 02, 2018 USD ($) $ / shares	Feb. 18, 2018 $ / shares	Feb. 17, 2018	Mar. 14, 2016 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Aug. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Aug. 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Aug. 31, 2016 USD ($)	Sep. 30, 2018 USD ($) shares $ / shares	Sep. 30, 2017 USD ($)
Convertible Notes
Interest Expense						$ 104,000	$ 238,000						$ 531,000	$ 685,000
Senior Secured Convertible Notes due August 15 2018
Convertible Notes
Stated interest rate (as a percent)			8.00%		10.00%
Principal amount					$ 8,000,000
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 | Subsequent Events
Convertible Notes
Payment on principle amount of note	$ 7,400,000	$ 7,400,000
Senior Secured Convertible Notes due August 15 2018 | Contractual obligations and other termination costs
Convertible Notes
Debt issuance costs					$ 100,000
Interest Expense						$ 6,000	$ 11,000						$ 30,000	$ 33,000
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 2018 | Minimum
Convertible Notes
Percentage of beneficial ownership if effective upon conversion date of debt instrument					9.90%
Interest Note
Convertible Notes
Conversion price (in dollars per share) | $ / shares						$ 4.25							$ 4.25
Number of shares issuable if notes converted to shares of common stock | shares													2,361,445
Semi-annual interest payments								$ 383,000	$ 463,000	$ 434,000	$ 420,000	$ 336,000
Senior Secured Convertible Notes Due August152019
Convertible Notes
Conversion price (in dollars per share) | $ / shares			$ 4.25		$ 8.50
Outstanding convertible notes payable						$ 10,000,000							$ 10,000,000
Senior Secured Convertible Notes due August 15 2023
Convertible Notes
Conversion price (in dollars per share) | $ / shares			$ 4.25
Senior Secured Convertible Notes due August 15 2023 | Subsequent Events
Convertible Notes
Conversion price (in dollars per share) | $ / shares		$ 0.5717
Extended maturity date		Aug. 15, 2023
Threshold limit of maximum holding percentage of number of shares of common stock outstanding prior to transactions (as a percent)		19.90%

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

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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