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Stockholders' Equity - Additional Information (Details) - USD ($)									3 Months Ended		9 Months Ended
	Sep. 01, 2019	May 01, 2019	Apr. 15, 2019	Apr. 01, 2019	Mar. 15, 2019	Mar. 13, 2019	Feb. 27, 2019	Jan. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 18, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under warrants (in shares)													115,000
Warrants outstanding, exercise price (in dollars per share)													$ 3.17
Aggregate shares of common stock options granted (in shares)											4,153,000
Exercise price of options (in dollars per share)											$ 1.84
Five year expiration
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period											5 years
Seven year expiration
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period											7 years
Ten year expiration
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period											10 years
2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock eligible for issuance (in shares)									13,000,000		13,000,000
Shares of common stock available for issuance (in shares)									1,890,346		1,890,346
Shares of common stock reserved for issuance (in shares)									10,359,786		10,359,786
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested stock options									$ 387,000		$ 387,000
Weighted average period of recognition											1 year 11 months 22 days
Employee Stock Option | Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock options granted (in shares)	15,000	10,000	24,000	150,000	50,000	154,000		250,000
Exercise price of options (in dollars per share)	$ 1.59	$ 1.38	$ 1.40	$ 1.70	$ 5.50	$ 1.73		$ 3.00
Vesting rights (percentage per year)		50.00%	50.00%	50.00%							33.33%
Employee Stock Option | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock options granted (in shares)							2,578,947
Exercise price of options (in dollars per share)							$ 1.70
Vested (in shares)											0
Employee Stock Option | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock options granted (in shares)							552,632
Exercise price of options (in dollars per share)							$ 1.70
Vested (in shares)											0
Employee Stock Option | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock options granted (in shares)							368,421
Exercise price of options (in dollars per share)							$ 1.70
Vested (in shares)											0
Performance Shares | Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of employment							2 years
Performance stock bonus											$ 90,000
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights (percentage per year)											33.00%
Compensation expense									14,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested stock options									144,000		$ 144,000
Weighted average period of recognition											1 year 11 days
Compensation expense related to restricted stock grants									47,000	$ 128,000	$ 213,000	$ 548,000
Restricted Stock | Non Management Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights (percentage per year)				50.00%
Shares issued to employees in connection with restricted stock grants, net of forfeitures (in shares)				60,000
Award vesting period (in years)				2 years
Managemnet Stock Bonus
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense									168,000		168,000
$3.00 | Employee Stock Option | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							736,842
Lower range target price limit (in dollars per share)							$ 3.00
$3.00 | Employee Stock Option | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							157,895
Lower range target price limit (in dollars per share)							$ 3.00
$3.00 | Employee Stock Option | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							105,263
Lower range target price limit (in dollars per share)							$ 3.00
$5.00 | Employee Stock Option | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							626,316
Lower range target price limit (in dollars per share)							$ 5.00
$5.00 | Employee Stock Option | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							134,211
Lower range target price limit (in dollars per share)							$ 5.00
$5.00 | Employee Stock Option | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							89,474
Lower range target price limit (in dollars per share)							$ 5.00
$7.00 | Employee Stock Option | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							515,789
Lower range target price limit (in dollars per share)							$ 7.00
$7.00 | Employee Stock Option | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							110,526
Lower range target price limit (in dollars per share)							$ 7.00
$7.00 | Employee Stock Option | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							73,684
Lower range target price limit (in dollars per share)							$ 7.00
$9.00 | Employee Stock Option | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							405,263
Lower range target price limit (in dollars per share)							$ 9.00
$9.00 | Employee Stock Option | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							86,842
Lower range target price limit (in dollars per share)							$ 9.00
$9.00 | Employee Stock Option | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							57,895
Lower range target price limit (in dollars per share)							$ 9.00
$11.00 | Employee Stock Option | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							294,737
Lower range target price limit (in dollars per share)							$ 11.00
$11.00 | Employee Stock Option | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							63,158
Lower range target price limit (in dollars per share)							$ 11.00
$11.00 | Employee Stock Option | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)							42,105
Lower range target price limit (in dollars per share)							$ 11.00
Equity Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to stock options									$ 66,000	$ 319,000	$ 382,000	$ 867,000
Warrant | Five year expiration
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period											5 years
Warrant | Seven year expiration
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period											7 years
Warrant | Ten year expiration
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period											10 years

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