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Note 2 - Restatement of Consolidated Financial Statements - Effect of Restatement on Financial Statement (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Mar. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Warrant liability | $ 41,771 |  | $ 44,194 |  | $ 48,106 |  |  |  | $ 50,425 |  | $ 32,599 |  | $ 14,725 |  |  |  | $ 44,194 |  | $ 32,599 |  | $ 41,771 |  | $ 50,425 |  | $ 39,602 | $ 28,516 |  |
Total liabilities | 48,598 |  | 49,231 |  | 51,813 |  |  |  | 52,944 |  | 34,731 |  | 16,546 |  |  |  | 49,231 |  | 34,731 |  | 48,598 |  | 52,944 |  | 49,362 | 30,835 |  |
Additional paid in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,008 | $ 63,505 |
Accumulated deficit | (103,035) |  | (113,304) |  | (117,556) |  |  |  | (119,268) | [1] | (94,722) |  | (68,284) |  |  |  | (113,304) |  | (94,722) |  | (103,035) |  | (119,268) | [1] | (100,052) | (98,395) | (73,051) |
Total shareholders’ equity | 35,191 |  | 2,072 |  | (3,740) |  |  |  | (6,495) |  | (12,944) |  | (4,253) |  |  |  | 2,072 |  | (12,944) |  | 35,191 |  | (6,495) |  | 43,454 | 14,632 | (9,532) | $ (9,532)
Change in fair value of warrant liability | (1,128) |  | (3,586) |  | (19,663) |  | $ (19,663) |  | (25,696) |  | (27,485) |  | (4,870) |  | $ 4,870 |  | (16,077) |  | (22,615) |  | (14,949) |  | (48,311) |  | (12,835) | (28,271) |  |
Total other expense | 11,041 |  | 3,505 |  | (19,727) |  |  |  | (25,660) |  | (27,631) |  | 4,733 |  |  |  | (16,222) |  | (22,896) |  | (5,181) |  | (48,557) |  | (2,978) | (28,667) |  |
Net income (loss) before provision for income taxes | 10,269 |  | 4,252 |  | (19,161) |  |  |  |  |  |  |  |  |  |  |  | (14,909) |  |  |  | (4,640) |  |  |  | (3,198) | (25,005) |  |
Net loss (restated) | 10,269 |  | 4,252 |  | (19,161) |  | (19,161) |  | (24,465) |  | (26,346) |  | 4,873 |  | 4,873 |  | (14,909) |  | (21,472) |  | (4,640) |  | (45,938) |  | (1,657) | (25,005) |  |
Net income (loss) attributable to common stockholders | $ 8,380 |  | $ 3,425 |  | $ (19,161) |  |  |  | $ (24,545) |  | $ (26,439) |  | $ 4,767 |  |  |  | $ (14,909) |  | $ (21,672) |  | $ (4,640) |  | $ (46,217) |  | (1,657) | $ (25,344) |  |
Basic net income (loss) per common share (in dollars per share) | $ 0.42 |  | $ 0.18 |  | $ (1.03) |  |  |  | $ (1.42) |  | $ (1.74) |  | $ 0.22 |  |  |  | $ (0.80) |  | $ (1.48) |  | $ (0.24) |  | $ (2.98) |  |  | $ (1.56) |  |
Diluted net income (loss) per common share (in dollars per share) | $ 0.35 |  | $ 0.02 |  | $ (1.03) |  |  |  | $ (1.42) |  | $ (1.74) |  | $ (0.02) |  |  |  | $ (0.80) |  | $ (1.48) |  | $ (0.24) |  | $ (2.98) |  |  | $ (1.56) |  |
Change in fair value of warrant liability | $ 1,128 |  | $ 3,586 |  | $ 19,663 |  | 19,663 |  | $ 25,696 |  | $ 27,485 |  | $ 4,870 |  | (4,870) |  | $ 16,077 |  | $ 22,615 |  | $ 14,949 |  | $ 48,311 |  | $ 12,835 | $ 28,271 |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities | 7,266 |  | 5,476 |  | 3,707 |  |  |  | 2,519 |  | 2,132 |  | 1,821 |  |  |  | 5,476 |  | 2,132 |  | 7,266 |  | 2,519 |  |  | 2,319 |  |
Additional paid in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 114,160 | 84,036 |
Accumulated deficit | (60,450) |  | (69,766) |  | (70,604) |  |  |  | (71,864) | [1] | (73,015) |  | (74,060) |  |  |  | (69,766) |  | (73,015) |  | (60,450) |  | (71,864) | [1] |  | (71,031) | (73,958) |
Total shareholders’ equity | 76,962 |  | 46,266 |  | 44,366 |  |  |  | 43,930 |  | 19,655 |  | 10,472 |  |  |  | 46,266 |  | 19,655 |  | 76,962 |  | 43,930 |  |  | 43,148 | 10,092 |
Change in fair value of warrant liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other expense | 9,913 |  | (81) |  | (64) |  |  |  | 36 |  | (146) |  | (137) |  |  |  | (145) |  | (281) |  | 9,768 |  | (246) |  |  | (396) |  |
Net income (loss) before provision for income taxes | 9,316 |  | 838 |  | 427 |  |  |  |  |  |  |  |  |  |  |  | 1,265 |  |  |  | 10,581 |  |  |  |  | 3,266 |  |
Net loss (restated) | 9,316 |  | 838 |  | 427 |  | 427 |  | 1,231 |  | 1,139 |  | 3 |  | 3 |  | 1,265 |  | 1,143 |  | 10,581 |  | 2,373 |  |  | 3,266 |  |
Net income (loss) attributable to common stockholders | $ 9,316 |  | $ 838 |  | $ 427 |  |  |  | $ 1,151 |  | $ 1,046 |  | $ (103) |  |  |  | $ 1,265 |  | $ 943 |  | $ 10,581 |  | $ 2,094 |  |  | $ 2,927 |  |
Basic net income (loss) per common share (in dollars per share) | $ 0.47 |  | $ 0.04 |  | $ 0.02 |  |  |  | $ 0.07 |  | $ 0.07 |  | $ (0.01) |  |  |  | $ 0.07 |  | $ 0.06 |  | $ 0.55 |  | $ 0.13 |  |  | $ 0.18 |  |
Diluted net income (loss) per common share (in dollars per share) | $ 0.37 |  | $ 0.03 |  | $ 0.02 |  |  |  | $ 0.05 |  | $ 0.05 |  | $ (0.01) |  |  |  | $ 0.05 |  | $ 0.05 |  | $ 0.43 |  | $ 0.10 |  |  | $ 0.14 |  |
Change in fair value of warrant liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability | $ 41,771 | [1] | $ 44,194 | [1] | $ 48,106 | [1] |  |  | $ 50,425 | [1] | $ 32,599 | [1] | $ 14,725 | [1] |  |  | 44,194 | [1] | 32,599 | [1] | 41,771 | [1] | 50,425 | [1] |  | 28,516 |  |
Total liabilities | 41,332 |  | 43,755 |  | 48,106 |  |  |  | 50,425 |  | 32,599 |  | 14,725 |  |  |  | 43,755 |  | 32,599 |  | 41,332 |  | 50,425 |  |  | 28,516 |  |
Additional paid in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,152) | (20,531) |
Accumulated deficit | (42,585) | [1],[2] | (43,538) | [1],[2] | (46,952) | [1] |  |  | (47,404) | [1] | (21,707) | [1] | 5,776 | [1] |  |  | (43,538) | [1],[2] | (21,707) | [1] | (42,585) | [1],[2] | (47,404) | [1] |  | (27,364) | 907 |
Total shareholders’ equity | (41,771) |  | (44,194) |  | (48,106) |  |  |  | (50,425) |  | (32,599) |  | (14,725) |  |  |  | (44,194) |  | (32,599) |  | (41,771) |  | (50,425) |  |  | (28,516) | $ (19,624) |
Change in fair value of warrant liability | (1,128) | [1] | (3,586) | [1] | (19,663) | [1] | (19,663) | [1] | (25,696) | [1] | (27,485) | [1] | (4,870) | [1] | 4,870 | [1] | (16,077) | [1] | (22,615) | [1] | (14,949) | [1] | (48,311) | [1] |  | (28,271) |  |
Total other expense | 1,128 |  | 3,586 |  | (19,663) |  |  |  | (25,696) |  | (27,485) |  | 4,870 |  |  |  | (16,077) |  | (22,615) |  | (14,949) |  | (48,311) |  |  | (28,271) |  |
Net income (loss) before provision for income taxes | 953 |  | 3,414 |  | (19,588) |  |  |  |  |  |  |  |  |  |  |  | (16,174) |  |  |  | (15,221) |  |  |  |  | (28,271) |  |
Net loss (restated) | 953 |  | 3,414 |  | (19,588) |  | (19,588) | [1] | (25,696) |  | (27,485) |  | 4,870 |  | 4,870 | [1] | (16,174) | [1] | (22,615) | [1] | (15,221) | [1] | (48,311) | [1] |  | (28,271) |  |
Net income (loss) attributable to common stockholders | $ (936) |  | $ 2,587 |  | $ (19,588) |  |  |  | $ (25,696) |  | $ (27,485) |  | $ 4,870 |  |  |  | $ (16,174) |  | $ (22,615) |  | $ (15,221) |  | $ (48,311) |  |  | $ (28,271) |  |
Basic net income (loss) per common share (in dollars per share) | $ (0.05) |  | $ 0.14 |  | $ (1.05) |  |  |  | $ (1.49) |  | $ (1.81) |  | $ 0.23 |  |  |  | $ (0.87) |  | $ (1.54) |  | $ (0.79) |  | $ (3.11) |  |  | $ (1.74) |  |
Diluted net income (loss) per common share (in dollars per share) | $ (0.02) |  | $ (0.01) |  | $ (1.05) |  |  |  | $ (1.47) |  | $ (1.79) |  | $ (0.01) |  |  |  | $ (0.85) |  | $ (1.53) |  | $ (0.67) |  | $ (3.08) |  |  | $ (1.70) |  |
Change in fair value of warrant liability | $ 1,128 | [1] | $ 3,586 | [1] | $ 19,663 | [1] | $ 19,663 | [1] | $ 25,696 | [1] | $ 27,485 | [1] | $ 4,870 | [1] | $ (4,870) | [1] | $ 16,077 | [1] | $ 22,615 | [1] | $ 14,949 | [1] | $ 48,311 | [1] |  | $ 28,271 |  |
[1] | Adjustments related to recording certain warrants as liabilities, see Note 2: "Restatement of Consolidated Financial Statements".
[2] | Adjustments related to change in valuation method of market-based restricted stock awards.

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