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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Stockholders' Equity | Stockholders' Equity Common Stock On November 10, 2020, the Company filed a registration statement on Form S-3 (the Shelf Registration Statement), covering the offering, from time to time, of up to $150.0 million of common stock, preferred stock, debt securities, warrants and units, which Shelf Registration Statement became effective on November 19, 2020. On March 25, 2021, the Company completed a public offering of 4,255,000 shares of its common stock at a public offering price of $16.25 per share. Net proceeds from the offering were approximately $64.7 million, after deducting underwriting discounts and commissions and offering expenses of $4.4 million. The shares were registered pursuant to the Company's Shelf Registration Statement discussed above. Outstanding Warrants The following equity classified warrants to purchase common stock were outstanding as of March 31, 2021:
| Shares |  | Exercise Price |  | Issuance date |  | Expiration date
Common stock warrants | 252,798 |  | $ | 1.84 |  |  | January 19, 2016 |  | January 19, 2026
Common stock warrants | 69,176 |  | 1.84 |  | March 31, 2016 |  | March 31, 2026
Common stock warrants | 131 |  | 1.84 |  | April 1, 2016 |  | April 1, 2026
Common stock warrants | 83,778 |  | 14.32 |  | September 7, 2017 |  | September 7, 2024
Common stock warrants | 20,944 |  | 14.32 |  | December 7, 2018 |  | December 7, 2025
| 426,827 |  |  |  |  |  |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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