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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
Accounting Policies [Abstract] |
Schedule of Diluted Net Loss Per Common Share | Diluted net loss per common share for the three months ended March 31, 2021 and 2020 was determined as follows (in thousands, except share and per share amounts):
| Three Months Ended March 31, |
| 2021 |  |  | 2020 |
Net loss | $ | (4,676 | ) |  | $ | (7,002 | )
Dilutive effect of warrant liability |  | (1,323 | ) |  |  | — |
Net loss allocated to common shares | $ | (5,999 | ) |  | $ | (7,002 | )
Weighted average common shares outstanding – basic |  | 25,802,700 |  |  |  | 9,744,577 |
Dilutive effect of warrant liability |  | 721,220 |  |  |  | — |
Weighted average common shares outstanding – diluted |  | 26,523,920 |  |  |  | 9,744,577 |
Net loss per share – diluted | $ | (0.23 | ) |  | $ | (0.72 | )
Summary of Antidilutive Securities Excluded from Computation of Weighted Average Common Stock Outstanding | The following potentially dilutive shares of common stock have not been included in the computation of diluted net loss per share for the three months ended March 31, 2021 and 2020, as the result would be anti-dilutive:
| Three Months Ended March 31, |
| 2021 |  |  | 2020 |
Outstanding stock options |  | 1,371,606 |  |  |  | 768,354 |
Outstanding restricted stock units |  | 96,974 |  |  |  | 85,754 |
Warrants to purchase common stock associated with June 2016 public offering |  | 421,867 |  |  |  | 421,867 |
Warrants to purchase common stock associated with March 2018 public offering – Series 2 |  | 798,810 |  |  |  | 798,810 |
Warrants to purchase common stock associated with December 2019 Public Offering |  | 4,472,205 |  |  |  | 4,472,205 |
Warrants to purchase common stock associated with December 2020 Public Offering - Series 2 |  | 6,800,000 |  |  |  | — |
Common stock associated with March 2019 Notes |  | 1,138,200 |  |  |  | 1,138,200 |
Warrants to purchase common stock associated with Solar loan agreement |  | 12,243 |  |  |  | 12,243 |
Total |  | 15,111,905 |  |  |  | 7,697,433 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1278-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258 + Details
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