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Stockholders' Equity - Additional Information (Details) - USD ($) |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
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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 |  |

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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