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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2024
Equity [Abstract]  
Schedule of changes in warrant liability
A reconciliation of the changes in the warrant liability during the six months ended June 30, 2024 and 2023 was as follows (in thousands):
Estimated fair value of warrant liability at December 31, 2023$4,021
Change in estimated fair value of the warrant liability443 
Estimated fair value of warrant liability at June 30, 2024$4,464
Estimated fair value of warrant liability at December 31, 2022$38,503
Change in estimated fair value of the warrant liability(22,726)
Estimated fair value of warrant liability at June 30, 2023$15,777
Schedule of stock option activity The following table provides the activity regarding the Company’s outstanding stock options during the six months ended June 30, 2024 that were granted in connection with the 2019 Plan (in thousands, except per share data):
Number of
Options		Weighted-Average
Grant Date
Fair Value
per Share		Weighted-Average
Exercise Price
per Share		Weighted-Average
Remaining
Contractual Term
Outstanding, December 31, 20232,219$3.75 $19.36 5.1 Years
Expired(735)$4.58 $23.38 
Outstanding, June 30, 20241,484$3.34 $17.38 4.8 Years
The following table provides the activity for all outstanding stock options during the six months ended June 30, 2024 (in thousands, except per share data):
Number of
Options		Weighted-Average
Exercise Price
per Share		Weighted-Average
Remaining
Contractual Term
Outstanding, December 31, 20233,409$14.90 
4.9 Years
Exercised(177)$3.08 
Expired(735)$23.38 
Outstanding, June 30, 20242,497$13.24 4.7 Years
Schedule of restricted stock activity
Activity related to the Company’s non-vested restricted stock grants for the six months ended June 30, 2024 is presented below (in thousands, except per share data):
Number of Shares of
Restricted Stock		Weighted-Average Grant Date
Fair Value per Share
Non-vested balance, December 31, 20232,068$19.16 
Granted2,621$12.41 
Vested(636)$33.27 
Forfeited(47)$36.48 
Non-vested balance, June 30, 20244,006$14.93