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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Common Stock Including Additional Paid in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2018 35,900      
Balance at Dec. 31, 2018 $ 279,353 $ (255) $ (237,700) $ 41,398
Net loss 0 0 (17,866) (17,866)
Foreign currency translation adjustment $ 0 313 0 313
Issuance of common stock under stock option plan (in shares) 318      
Issuance of common stock under stock option plan $ 1,135 0 0 1,135
Share-based compensation expense 1,853 0 0 1,853
Collection of stock subscription receivable $ 302 0 0 302
Issuance of common stock offering, net of issuance cost (in shares) 4,848      
Issuance of common stock offering, net of issuance cost $ 37,487 0 0 37,487
Balance (in shares) at Sep. 30, 2019 41,066      
Balance at Sep. 30, 2019 $ 320,130 58 (255,566) 64,622
Balance (in shares) at Jun. 30, 2019 41,003      
Balance at Jun. 30, 2019 $ 319,045 (216) (249,416) 69,413
Net loss 0 0 (6,150) (6,150)
Foreign currency translation adjustment $ 0 274 0 274
Issuance of common stock under stock option plan (in shares) 63      
Issuance of common stock under stock option plan $ 288 0 0 288
Share-based compensation expense $ 797 0 0 797
Balance (in shares) at Sep. 30, 2019 41,066      
Balance at Sep. 30, 2019 $ 320,130 58 (255,566) 64,622
Balance (in shares) at Dec. 31, 2019 41,519      
Balance at Dec. 31, 2019 $ 324,808 (106) 430,929 755,631
Net loss 0 0 (9,383) (9,383)
Foreign currency translation adjustment $ 0 (322) 0 (322)
Issuance of common stock under stock option plan (in shares) 0      
Issuance of common stock under stock option plan $ 0 0 0 0
Share-based compensation expense $ 9,787 0 0 9,787
Tender Offer (in shares) (14,000)      
Tender Offer $ (93,240) 0 (326,760) (420,000)
Collection of stock subscription receivable $ 10,426 0 0 10,426
Balance (in shares) at Sep. 30, 2020 29,224      
Balance at Sep. 30, 2020 $ 251,781 (428) 94,786 346,139
Balance (in shares) at Jun. 30, 2020 28,897      
Balance at Jun. 30, 2020 $ 246,395 (137) 97,312 343,570
Net loss 0 0 (2,526) (2,526)
Foreign currency translation adjustment $ 0 (291) 0 (291)
Issuance of common stock under stock option plan (in shares) 327      
Issuance of common stock under stock option plan $ 2,169 0 0 2,169
Stock subscription receivable 62 0 0 62
Share-based compensation expense $ 3,155 0 0 3,155
Balance (in shares) at Sep. 30, 2020 29,224      
Balance at Sep. 30, 2020 $ 251,781 $ (428) $ 94,786 $ 346,139