XML 22 R12.htm IDEA: XBRL DOCUMENT
v3.21.2

Stockholders' Equity | 9 Months Ended
--- | ---
Sep. 30, 2021
Stockholders' Equity |
Stockholders' Equity | (7) Stockholders’ Equity ​ In May 2016, the Company entered into a controlled equity offering sales agreement (the “Cantor Agreement”) with Cantor Fitzgerald & Co. (“Cantor”) to allow the Company to issue and sell shares of its common stock from time to time through Cantor, acting as agent. At September 30, 2021, the Company had $50.0 million remaining in aggregate gross offering price available under the Company’s November 2020 prospectus. ​ In July 2021, the Company issued 6,845,238 shares of its common stock in an underwritten public offering resulting in net proceeds to the Company of $269.9 million, after deducting underwriting fees and offering expenses. ​ The changes in Stockholders’ Equity during the three and nine months ended September 30, 2021 and 2020 are summarized below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated |  | ​ | ​ |  | ​ | ​
​ | ​ | Common | ​ | Common | ​ | Additional | ​ | Other | ​ | ​ | ​ | ​ | Total
​ | ​ | Stock | ​ | Stock Par | ​ | Paid-In | ​ | Comprehensive | ​ | Accumulated | ​ | Stockholders’
​ | ​ | Shares | ​ | Value | ​ | Capital | ​ | Income | ​ | Deficit | ​ | Equity
​ | ​ | (In thousands, except share amounts)
Consolidated balance at December 31, 2020 |  | 39,603,771 |  | $ | 40 |  | $ | 1,279,824 |  | $ | 2,589 |  | $ | (1,073,096) |  | $ | 209,357
Shares issued under stock option and employee stock purchase plans |  | 10,867 |  |  | — |  |  | 74 |  |  | — |  |  | — |  |  | 74
Stock-based compensation |  | — |  |  | — |  |  | 1,275 |  |  | — |  |  | — |  |  | 1,275
Unrealized loss on marketable securities |  | — |  |  | — |  |  | — |  |  | (2) |  |  | — |  |  | (2)
Net loss |  | — |  |  | — |  |  | — |  |  | — |  |  | (16,538) |  |  | (16,538)
Consolidated balance at March 31, 2021 |  | 39,614,638 |  | $ | 40 |  | $ | 1,281,173 |  | $ | 2,587 |  | $ | (1,089,634) |  | $ | 194,166
Shares issued under stock option and employee stock purchase plans |  | 2,058 |  |  | — |  |  | (25) |  |  | — |  |  | — |  |  | (25)
Stock-based compensation |  | — |  |  | — |  |  | 1,509 |  |  | — |  |  | — |  |  | 1,509
Unrealized gain on marketable securities |  | — |  |  | — |  |  | — |  |  | 5 |  |  | — |  |  | 5
Net loss |  | — |  |  | — |  |  | — |  |  | — |  |  | (13,373) | ​ |  | (13,373)
Consolidated balance at June 30, 2021 |  | 39,616,696 | ​ | $ | 40 | ​ | $ | 1,282,657 | ​ | $ | 2,592 | ​ | $ | (1,103,007) | ​ | $ | 182,282
Shares issued under stock option and employee stock purchase plans | ​ | 201,406 | ​ | ​ | — | ​ | ​ | 2,004 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,004
Shares issued in underwritten offering, net | ​ | 6,845,238 | ​ | ​ | 7 | ​ | ​ | 269,886 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 269,893
Stock-based compensation | ​ | — | ​ | ​ | — | ​ | ​ | 3,029 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,029
Unrealized loss on marketable securities | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (44) | ​ | ​ | — | ​ | ​ | (44)
Net loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (20,452) | ​ | ​ | (20,452)
Consolidated balance at September 30, 2021 | ​ | 46,663,340 | ​ | $ | 47 | ​ | $ | 1,557,576 | ​ | $ | 2,548 | ​ | $ | (1,123,459) | ​ | $ | 436,712
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated |  | ​ | ​ |  | ​ | ​
​ | ​ | Common | ​ | Common | ​ | Additional | ​ | Other | ​ | ​ | ​ | ​ | Total
​ | ​ | Stock | ​ | Stock Par | ​ | Paid-In | ​ | Comprehensive | ​ | Accumulated | ​ | Stockholders’
​ | ​ | Shares | ​ | Value | ​ | Capital | ​ | Income | ​ | Deficit | ​ | Equity
​ | ​ | (In thousands, except share amounts)
Consolidated balance at December 31, 2019 |  | 16,972,077 | ​ | $ | 17 | ​ | $ | 1,104,706 | ​ | $ | 2,619 | ​ | $ | (1,013,316) | ​ | $ | 94,026
Shares issued under stock option and employee stock purchase plans |  | 12,573 | ​ |  | — | ​ |  | 24 | ​ |  | — | ​ |  | — | ​ |  | 24
Shares issued in connection with at the market agreement |  | 746,152 | ​ |  | 1 | ​ |  | 1,613 | ​ |  | — | ​ |  | — | ​ |  | 1,614
Stock-based compensation |  | — | ​ |  | — | ​ |  | 686 | ​ |  | — | ​ |  | — | ​ |  | 686
Unrealized loss on marketable securities |  | — | ​ |  | — | ​ |  | — | ​ |  | (22) | ​ |  | — | ​ |  | (22)
Net loss |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (12,625) | ​ |  | (12,625)
Consolidated balance at March 31, 2020 |  | 17,730,802 | ​ | $ | 18 | ​ | $ | 1,107,029 | ​ | $ | 2,597 | ​ | $ | (1,025,941) | ​ | $ | 83,703
Shares issued in connection with at the market agreement |  | 5,978,452 | ​ |  | 6 | ​ |  | 23,686 | ​ |  | — | ​ |  | — | ​ |  | 23,692
Shares issued in underwritten offering, net |  | 15,384,614 | ​ |  | 15 | ​ |  | 141,346 | ​ |  | — | ​ |  | — | ​ |  | 141,361
Stock-based compensation |  | — | ​ |  | — | ​ |  | 722 | ​ |  | — | ​ |  | — | ​ |  | 722
Unrealized loss on marketable securities |  | — | ​ |  | — | ​ |  | — | ​ |  | (3) | ​ |  | — | ​ |  | (3)
Net loss |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (11,031) | ​ |  | (11,031)
Consolidated balance at June 30, 2020 |  | 39,093,868 | ​ | $ | 39 | ​ | $ | 1,272,783 | ​ | $ | 2,594 | ​ | $ | (1,036,972) | ​ | $ | 238,444
Shares issued under stock option and employee stock purchase plans | ​ | 68,204 | ​ | ​ | — | ​ | ​ | 194 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 194
Shares issued in connection with at the market agreement | ​ | 400,400 | ​ | ​ | 1 | ​ | ​ | 4,296 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,297
Stock-based compensation | ​ | — | ​ | ​ | — | ​ | ​ | 1,250 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,250
Unrealized gain on marketable securities | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 14 | ​ | ​ | — | ​ | ​ | 14
Net loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (14,224) | ​ | ​ | (14,224)
Consolidated balance at September 30, 2020 | ​ | 39,562,472 | ​ | $ | 40 | ​ | $ | 1,278,523 | ​ | $ | 2,608 | ​ | $ | (1,051,196) | ​ | $ | 229,975
​

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_StockholdersEquityNoteDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration