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RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS - Restated Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2019
OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (10,541) | $ (4,510) | $ (10,657) | $ (6,320) | $ (1,696) | $ (3,223) | $ (4,194) | $ (2,171) | $ (2,938) | $ (925) | $ (232) | $ (3,370) | $ (6,365) | $ (3,602) | $ (9,588) | $ (4,527) | $ (32,028) | $ (11,284) | $ (7,465) | $ (50,800)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash stock-based compensation |  |  |  |  |  |  |  | 409 |  |  |  | 211 | 984 | 445 | 1,424 | 678 | 1,750 | 1,794 | 1,214 |
(Gain) loss on disposal of property and equipment |  |  |  |  |  |  |  | (18) |  |  |  |  | (80) | (34) | (99) | (59) | 672 | (131) | (177) |
Non-cash interest and amortization of debt discount |  |  |  |  |  |  |  | 17 |  |  |  | 139 | 94 | 65 | 118 | 98 | 301 | 140 | 113 |
Bad debt expense |  |  |  |  |  |  |  | 168 |  |  |  | 199 | 382 | 331 | 510 | 460 | 2,534 | 471 | 557 |
Provision for inventory reserve |  |  |  |  |  |  |  | 221 |  |  |  | 248 | 1,091 | 480 | 1,361 | 804 | 3,172 | 1,467 | 877 |
Depreciation and amortization |  |  |  |  |  |  |  | 1,370 |  |  |  | 1,603 | 3,278 | 3,164 | 5,586 | 4,679 | 8,009 | 7,829 | 5,956 |
Change in fair value of warrant liabilities |  |  |  |  |  |  |  |  |  | 0 | 0 | 1,490 |  | 1,490 |  | 1,490 | 0 | 0 | 1,490 |
Deferred income taxes, net |  |  |  |  |  |  |  | 16 |  |  |  | 15 | (159) | 30 | (154) | 46 | (7) | (183) | 62 |
Recognition of deferred gain from sale-leaseback transactions |  |  |  |  |  |  |  | 0 |  |  |  | 0 | 0 | 0 | 0 | 0 |  |  | 0 |
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  | (3,149) |  |  |  | (1,003) | (5,332) | (2,418) | (9,964) | (2,316) | (8,488) | (6,234) | (2,538) |
Finance receivables, net |  |  |  |  |  |  |  | 9,168 |  |  |  | (5) | 7,332 | 2,119 | 8,202 | (2,180) | (8) | 2,228 | (10,832) |
Inventory, net |  |  |  |  |  |  |  | (3,900) |  |  |  | (2,713) | (7,615) | (3,403) | (7,777) | (2,957) | (5,242) | (3,661) | (4,463) |
Prepaid expenses and other current assets |  |  |  |  |  |  |  | (103) |  |  |  | (124) | (2) | (442) | 355 | (454) | (395) | 377 | 153 |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,874 |
Deferred revenue |  |  |  |  |  |  |  | 171 |  |  |  | (59) | 570 | 326 | 351 | 157 | (98) | 351 | 115 |
Income taxes payable |  |  |  |  |  |  |  | (55) |  |  |  | (3) | (40) | 3 | (30) | 4 | 254 | (13) | (8) |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  | 721 |  |  |  | (5,915) | 1,909 | (4,146) | 7,668 | (2,815) | (28,701) | 12,431 | (6,072) |
INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of property and equipment, including rentals |  |  |  |  |  |  |  | (720) |  |  |  | (623) | (1,734) | (1,752) | (3,138) | (2,536) | (4,346) | (3,978) | (3,787) |
Proceeds from sale of property and equipment |  |  |  |  |  |  |  | 45 |  |  |  |  | 157 | 61 | 252 | 105 | 116 | 298 | 348 |
Net cash used in investing activities |  |  |  |  |  |  |  | (675) |  |  |  | (623) | (66,758) | (1,691) | (68,067) | (2,431) | (4,230) | (68,861) | (3,439) |
FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash used in retirement of common stock |  |  |  |  |  |  |  |  |  |  |  | (31) |  | (31) | (156) | (31) | (81) | (552) | (31) |
Proceeds from exercise of common stock warrants |  |  |  |  |  |  |  |  |  |  |  | 6,193 |  | 6,193 |  | 6,193 | 0 | 0 | 6,193 |
Payment of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  | (445) |  | (445) | (90) | (156) | (445) | (90) |
Repayment of line of credit |  |  |  |  |  |  |  |  |  |  |  |  | (7,111) | (106) | (7,111) | (106) | 0 | (7,111) | (106) |
Repayment of capital lease obligations and long-term debt |  |  |  |  |  |  |  | (809) |  |  |  | (698) | (1,043) | (1,457) | (3,751) | (2,212) | (23,254) | (5,355) | (2,982) |
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  | 39,079 |  |  |  | 5,464 | 67,464 | 4,599 | 64,709 | 3,754 | (23,569) | 127,649 | 2,984 |
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  | 39,125 |  |  |  | (1,074) | 2,615 | (1,238) | 4,310 | (1,492) | (56,500) | 71,219 | (6,527) |
Cash and cash equivalents at beginning of year |  |  |  | $ 83,964 | 17,055 | 15,360 | 51,870 | 12,745 | 17,780 | 18,034 | 18,198 | 19,272 | 12,745 | 19,272 | 12,745 | 19,272 | 83,964 | 12,745 | 19,272 | 19,272
Cash and cash equivalents at end of year | $ 27,464 |  |  |  | 83,964 | 17,055 | 15,360 | 51,870 | 12,745 | 17,780 | 18,034 | 18,198 | 15,360 | 18,034 | 17,055 | 17,780 | $ 27,464 | 83,964 | 12,745 | 27,464
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  | 1,160 | (12,516) | (213) | 243 | 136 | 233 | (2,464) | (12,729) | (2,231) | (11,569) | (2,095) |  |  | (1,852) |
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash stock-based compensation |  |  |  |  |  |  |  | 576 |  |  |  | 211 | 1,356 | 445 | 2,005 | 678 |  |  | 1,214 |
(Gain) loss on disposal of property and equipment |  |  |  |  |  |  |  | (18) |  |  |  |  | (83) | (31) | (112) | (59) |  |  | (177) |
Non-cash interest and amortization of debt discount |  |  |  |  |  |  |  | 15 |  |  |  | 105 | 86 | 26 | 100 | 98 |  |  | 113 |
Bad debt expense |  |  |  |  |  |  |  | 118 |  |  |  | 97 | 291 | 450 | 506 | 577 |  |  | 764 |
Provision for inventory reserve |  |  |  |  |  |  |  | 0 |  |  |  | 0 | 0 | 0 | 0 | 0 |  |  | 0 |
Depreciation and amortization |  |  |  |  |  |  |  | 1,492 |  |  |  | 1,301 | 3,476 | 2,564 | 5,858 | 3,774 |  |  | 5,591 |
Change in fair value of warrant liabilities |  |  |  |  |  |  |  |  |  | 0 | 0 | 1,490 |  | 1,490 |  | 1,490 |  |  | 1,490 |
Deferred income taxes, net |  |  |  |  |  |  |  | (535) |  |  |  | (115) | 8,537 | (115) | 6,400 | 94 |  |  | 54 |
Recognition of deferred gain from sale-leaseback transactions |  |  |  |  |  |  |  | (43) |  |  |  | (215) | (93) | (430) | (143) | (646) |  |  | (560) |
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  | (3,192) |  |  |  | (1,038) | (5,290) | (2,347) | (12,972) | (2,388) |  |  | (2,988) |
Finance receivables, net |  |  |  |  |  |  |  | 8,771 |  |  |  | (5) | 7,958 | 2,119 | 11,114 | (2,113) |  |  | (12,119) |
Inventory, net |  |  |  |  |  |  |  | (3,648) |  |  |  | (2,223) | (5,822) | (2,689) | (5,624) | (2,042) |  |  | (2,399) |
Prepaid expenses and other current assets |  |  |  |  |  |  |  | (217) |  |  |  | (224) | (606) | (542) | (564) | (406) |  |  | (304) |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,410 |
Deferred revenue |  |  |  |  |  |  |  | 0 |  |  |  | 0 | 0 | 0 | (185) | 0 |  |  | 0 |
Income taxes payable |  |  |  |  |  |  |  | 0 |  |  |  | (10) | 40 | (12) | 0 | (18) |  |  | (8) |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  | 1,005 |  |  |  | (6,265) | 4,138 | (5,143) | 8,689 | (4,295) |  |  | (6,771) |
INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of property and equipment, including rentals |  |  |  |  |  |  |  | (992) |  |  |  | (810) | (1,767) | (1,944) | (3,005) | (2,818) |  |  | (4,041) |
Proceeds from sale of property and equipment |  |  |  |  |  |  |  | 45 |  |  |  |  | 157 | 61 | 252 | 105 |  |  | 348 |
Net cash used in investing activities |  |  |  |  |  |  |  | (947) |  |  |  | (810) | (66,791) | (1,883) | (67,934) | (2,713) |  |  | (3,693) |
FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash used in retirement of common stock |  |  |  |  |  |  |  |  |  |  |  | (31) |  | (31) | (156) | (31) |  |  | (31) |
Proceeds from exercise of common stock warrants |  |  |  |  |  |  |  |  |  |  |  | 6,193 |  | 6,193 |  | 6,193 |  |  | 6,193 |
Payment of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  | (445) |  | (445) | (90) |  |  | (90) |
Repayment of line of credit |  |  |  |  |  |  |  |  |  |  |  |  | (7,111) | 0 | (7,111) | 0 |  |  | (106) |
Repayment of capital lease obligations and long-term debt |  |  |  |  |  |  |  | (821) |  |  |  | (161) | (2,138) | (374) | (3,778) | (556) |  |  | (2,029) |
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  | 39,067 |  |  |  | 6,001 | 65,294 | 5,788 | 63,607 | 5,516 |  |  | 3,937 |
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  | 39,125 |  |  |  | (1,074) | 2,641 | (1,238) | 4,362 | (1,492) |  |  | (6,527) |
Cash and cash equivalents at beginning of year |  |  |  |  | 17,107 | 15,386 | 51,870 | 12,745 | 17,780 | 18,034 | 18,198 | 19,272 | 12,745 | 19,272 | 12,745 | 19,272 |  | 12,745 | 19,272 | 19,272
Cash and cash equivalents at end of year |  |  |  |  |  | 17,107 | 15,386 | 51,870 | 12,745 | 17,780 | 18,034 | 18,198 | 15,386 | 18,034 | 17,107 | 17,780 |  |  | 12,745 |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  | (4,383) | 8,322 | (1,958) | (3,181) | (1,061) | (465) | (906) | 6,364 | (1,371) | 1,981 | (2,432) |  |  | (5,613) |
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash stock-based compensation |  |  |  |  |  |  |  | (167) |  |  |  | 0 | (372) | 0 | (581) | 0 |  |  | 0 |
(Gain) loss on disposal of property and equipment |  |  |  |  |  |  |  | 0 |  |  |  |  | 3 | (3) | 13 | 0 |  |  | 0 |
Non-cash interest and amortization of debt discount |  |  |  |  |  |  |  | 2 |  |  |  | 34 | 8 | 39 | 18 | 0 |  |  | 0 |
Bad debt expense |  |  |  |  |  |  |  | 50 |  |  |  | 102 | 91 | (119) | 4 | (117) |  |  | (207) |
Provision for inventory reserve |  |  |  |  |  |  |  | 221 |  |  |  | 248 | 1,091 | 480 | 1,361 | 804 |  |  | 877 |
Depreciation and amortization |  |  |  |  |  |  |  | (122) |  |  |  | 302 | (198) | 600 | (272) | 905 |  |  | 365 |
Change in fair value of warrant liabilities |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  | 0 |  | 0 |  |  | 0 |
Deferred income taxes, net |  |  |  |  |  |  |  | 551 |  |  |  | 130 | (8,696) | 145 | (6,554) | (48) |  |  | 8 |
Recognition of deferred gain from sale-leaseback transactions |  |  |  |  |  |  |  | 43 |  |  |  | 215 | 93 | 430 | 143 | 646 |  |  | 560 |
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  | 43 |  |  |  | 35 | (42) | (71) | 3,008 | 72 |  |  | 450 |
Finance receivables, net |  |  |  |  |  |  |  | 397 |  |  |  | 0 | (626) | 0 | (2,912) | (67) |  |  | 1,287 |
Inventory, net |  |  |  |  |  |  |  | (252) |  |  |  | (490) | (1,793) | (714) | (2,153) | (915) |  |  | (2,064) |
Prepaid expenses and other current assets |  |  |  |  |  |  |  | 114 |  |  |  | 100 | 604 | 100 | 919 | (48) |  |  | 457 |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,464 |
Deferred revenue |  |  |  |  |  |  |  | 171 |  |  |  | (59) | 570 | 326 | 536 | 157 |  |  | 115 |
Income taxes payable |  |  |  |  |  |  |  | (55) |  |  |  | 7 | (80) | 15 | (30) | 22 |  |  | 0 |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  | (284) |  |  |  | 350 | (2,229) | 997 | (1,021) | 1,480 |  |  | 699 |
INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of property and equipment, including rentals |  |  |  |  |  |  |  | 272 |  |  |  | 187 | 33 | 192 | (133) | 282 |  |  | 254 |
Proceeds from sale of property and equipment |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 | 0 | 0 | 0 |  |  | 0 |
Net cash used in investing activities |  |  |  |  |  |  |  | 272 |  |  |  | 187 | 33 | 192 | (133) | 282 |  |  | 254 |
FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash used in retirement of common stock |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 | 0 |  |  | 0 |
Proceeds from exercise of common stock warrants |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |  |  | 0 |
Payment of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |  |  | 0 |
Repayment of line of credit |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (106) | 0 | (106) |  |  | 0 |
Repayment of capital lease obligations and long-term debt |  |  |  |  |  |  |  | 12 |  |  |  | (537) | 1,095 | (1,083) | 27 | (1,656) |  |  | (953) |
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  | 12 |  |  |  | (537) | 2,170 | (1,189) | 1,102 | (1,762) |  |  | (953) |
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  | 0 |  |  |  | 0 | (26) | 0 | (52) | 0 |  |  | 0 |
Cash and cash equivalents at beginning of year |  |  |  |  | $ (52) | (26) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  | $ 0 | 0 | $ 0
Cash and cash equivalents at end of year |  |  |  |  |  | $ (52) | $ (26) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (26) | $ 0 | $ (52) | $ 0 |  |  | $ 0 |

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