Condensed Consolidated Statement of Changes in Redeemable Noncontrolling Interest and Stockholders' Deficit - (Unaudited) - USD ($) $ in Thousands | Total | Redeemable Noncontrolling Interest [Member] | Class A Common Stock [Member] | Class B Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] |
Beginning balance at Dec. 31, 2018 | $ (82,853) | | $ 203 | $ 232 | $ 150,595 | $ (233,883) |
Beginning balance, redeemable noncontrolling interest at Dec. 31, 2018 | | $ 62,482 | | | | |
Beginning balance, shares at Dec. 31, 2018 | | | 20,347,065 | 23,094,221 | | |
Net loss | (8,645) | (6,411) | | | | (8,645) |
Share-based compensation | 1,095 | | | | 1,095 | |
Issuance of Class A Common Stock under registered direct offering | 5,443 | | $ 37 | | 5,406 | |
Issuance of Class A Common Stock under registered direct offering, shares | | | 3,636,364 | | | |
Issuance of Class A Common Stock to a related party under the Letter Agreements | 19,500 | | $ 114 | | 19,386 | |
Issuance of Class A Common Stock to a related party under the Letter Agreements, shares | | | 11,443,975 | | | |
Issuance of Letter Agreement and warrants to purchase Class A Common stock - related party | (492) | | | | (492) | |
Vesting of restricted stock units, shares | | | 11,666 | | | |
Change in redemption value of noncontrolling interest | 18,803 | (18,803) | | | | 18,803 |
Ending balance at Sep. 30, 2019 | (47,149) | | $ 354 | $ 232 | 175,990 | (223,725) |
Ending balance, redeemable noncontrolling interest at Sep. 30, 2019 | | 37,268 | | | | |
Ending balance, shares at Sep. 30, 2019 | | | 35,439,070 | 23,094,221 | | |
Beginning balance at Jun. 30, 2019 | (49,902) | | $ 298 | $ 232 | 167,125 | (217,557) |
Beginning balance, redeemable noncontrolling interest at Jun. 30, 2019 | | 37,060 | | | | |
Beginning balance, shares at Jun. 30, 2019 | | | 29,826,782 | 23,094,221 | | |
Net loss | (3,608) | (2,352) | | | | (3,608) |
Share-based compensation | 413 | | | | 413 | |
Issuance of Class A Common Stock to a related party under the Letter Agreements | 9,000 | | $ 56 | | 8,944 | |
Issuance of Class A Common Stock to a related party under the Letter Agreements, shares | | | 5,612,288 | | | |
Issuance of Letter Agreement and warrants to purchase Class A Common stock - related party | (492) | | | | (492) | |
Change in redemption value of noncontrolling interest | (2,560) | 2,560 | | | | (2,560) |
Ending balance at Sep. 30, 2019 | (47,149) | | $ 354 | $ 232 | 175,990 | (223,725) |
Ending balance, redeemable noncontrolling interest at Sep. 30, 2019 | | 37,268 | | | | |
Ending balance, shares at Sep. 30, 2019 | | | 35,439,070 | 23,094,221 | | |
Beginning balance at Dec. 31, 2019 | (49,023) | | $ 409 | $ 232 | 183,858 | (233,522) |
Beginning balance, redeemable noncontrolling interest at Dec. 31, 2019 | | 40,183 | | | | |
Beginning balance, shares at Dec. 31, 2019 | | | 40,918,522 | 23,094,221 | | |
Net loss | (9,625) | (4,784) | | | | (9,625) |
Share-based compensation | 737 | | | | 737 | |
Issuance of Class A Common Stock under ATM offering | 9,731 | | $ 39 | | 9,692 | |
Issuance of Class A Common Stock under ATM offering, shares | | | 3,847,405 | | | |
Issuance of Class A Common Stock to a related party under the Letter Agreements | 7,000 | | $ 44 | | 6,956 | |
Issuance of Class A Common Stock to a related party under the Letter Agreements, shares | | | 4,375,000 | | | |
Vesting of restricted stock units, shares | | | 11,667 | | | |
Change in redemption value of noncontrolling interest | (10,192) | 10,192 | | | | (10,192) |
Ending balance at Sep. 30, 2020 | (51,372) | | $ 492 | $ 232 | 201,243 | (253,339) |
Ending balance, redeemable noncontrolling interest at Sep. 30, 2020 | 45,591 | 45,591 | | | | |
Ending balance, shares at Sep. 30, 2020 | | | 49,152,594 | 23,094,221 | | |
Beginning balance at Jun. 30, 2020 | (69,528) | | $ 479 | $ 232 | 198,634 | (268,873) |
Beginning balance, redeemable noncontrolling interest at Jun. 30, 2020 | | 63,378 | | | | |
Beginning balance, shares at Jun. 30, 2020 | | | 47,943,495 | 23,094,221 | | |
Net loss | (1,533) | (720) | | | | (1,533) |
Share-based compensation | 171 | | | | 171 | |
Issuance of Class A Common Stock under ATM offering | 2,451 | | $ 13 | | 2,438 | |
Issuance of Class A Common Stock under ATM offering, shares | | | 1,209,099 | | | |
Change in redemption value of noncontrolling interest | 17,067 | (17,067) | | | | 17,067 |
Ending balance at Sep. 30, 2020 | (51,372) | | $ 492 | $ 232 | $ 201,243 | $ (253,339) |
Ending balance, redeemable noncontrolling interest at Sep. 30, 2020 | $ 45,591 | $ 45,591 | | | | |
Ending balance, shares at Sep. 30, 2020 | | | 49,152,594 | 23,094,221 | | |