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Stock-Based Compensation - Additional Information (Details) | 12 Months Ended |
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Dec. 31, 2020 USD ($) Plan $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock compensation plans | Plan | 3 |  |
Common stock reverse stock split ratio | 0.05555555555 |  |
Common stock reverse stock split description | one-for-eighteen |  |
Number of options outstanding | 3,621,479 | 91,403 | 49,798
Range of exercise prices | $ / shares | $ 10.63 | $ 139.96 | $ 233.45
Aggregate intrinsic value of options exercised | $ | $ 0 | $ 0 |
Unrecognized stock-based compensation expense | $ | $ 17,100,000 |  |
Unrecognized stock-based compensation expense, recognized over estimated weighted average period | 2 years 8 months 12 days |  |
Stock-based compensation expense | $ | $ 3,171,000 | $ 1,308,000 |
PRSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ | $ 0 |  |
Number of shares vested | 3,059 |  |
Value of shares vested | $ | $ 205,000 |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of exercise prices | $ / shares | $ 0.96 |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of exercise prices | $ / shares | $ 2,147 |  |
2020 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized for issuance | 4,860,000 |  |
Number of options outstanding | 692,956 |  |
Options granted, expiration period | 10 years |  |
Stock awards available for grant | 4,167,044 |  |
Stock awards available for grant | 4,167,044 |  |
Common stock, number of shares reserved for issuance | 4,860,000 |  |
2014 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized for issuance | 0 |  |
Number of options outstanding | 126,974 |  |
Options granted, expiration period | 10 years |  |
Common stock, number of shares reserved for issuance | 0 |  |
2007 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options outstanding | 1,151 |  |
Options granted, expiration period | 10 years |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + 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=120381028&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=120381028&loc=d3e5070-113901 + 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=120381028&loc=d3e5070-113901 + Details
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