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Revenue Recognition - Schedule of Changes in Account Balances as a Result of the Adoptions of ACS 606 (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2017
Assets |  |  |  |  |
Cash and cash equivalents |  | $ 11,298 | $ 13,049 |  |
Accounts receivable, net |  | 10,082 | 18,877 |  |
Inventory |  | 19,531 | 21,831 |  |
Prepaid expenses and other current assets |  | 6,430 | 10,111 |  |
Total current assets |  | 47,341 | 63,868 |  |
Property and equipment, net |  | 1,442 | 1,071 |  |
Other assets |  | 6,676 | 2,406 |  |
Total assets |  | 55,459 | 67,345 |  |
Liabilities and stockholders’ equity |  |  |  |  |
Current portion of long-term debt |  | 9,821 | 301 |  |
Accounts payable |  | 7,234 | 27,295 |  |
Accrued expenses |  | 10,265 | 16,381 |  |
Deferred revenue |  | 291 | 4,223 | $ 770 |
Total current liabilities |  | 27,611 | 48,200 |  |
Income tax payable |  | 1,961 | 807 |  |
Long-term debt, less current portion |  | 362 | 13,209 |  |
Total liabilities |  | 29,934 | 62,216 |  |
Commitments and contingencies |  |  |  |  |
Common stock, $0.001 par value per share; 100,000,000 shares authorized: 20,437,235 shares issued and outstanding at December 31, 2019; 100,000,000 shares authorized; 15,591,357 shares issued and outstanding at December 31, 2018 |  | 20 | 15 |  |
Preferred Stock |  |  |  |  |
Additional paid-in capital |  | 191,751 | 148,641 |  |
Accumulated deficit |  | (166,246) | (143,527) |  |
Total stockholders’ equity |  | 25,525 | 5,129 |  | $ (89,911)
Total liabilities and stockholders’ equity |  | 55,459 | 67,345 |  |
Net revenues |  | 116,251 | 135,665 |  |
Cost of revenues |  | 81,742 | 87,576 |  |
Gross profit |  | 34,509 | 48,089 |  |
Operating expenses: |  |  |  |  |
Research and development |  | 26,064 | 23,247 |  |
Sales and marketing |  | 13,908 | 12,228 |  |
General and administrative |  | 16,182 | 7,220 |  |
Restructuring costs | $ 747 | 736 |  |  |
Total operating expenses |  | 56,890 | 42,695 |  |
Income (loss) from operations |  | (22,381) | 5,394 |  |
Interest expense |  | (1,522) | (1,828) |  |
Other expense, net |  | (543) | (565) |  |
Income (loss) before income taxes |  | (24,446) | 2,031 |  |
Income tax expense |  | (1,388) | (754) |  |
Net income (loss) |  | (25,834) | 1,277 |  |
Net loss attributable to common stockholders |  | $ (25,834) | $ (8,875) |  |
Net loss per share attributable to common stockholders, basic and diluted |  | $ (1.39) | $ (2.57) |  |
Weighted–average shares used in computing net loss per share attributable to common stockholders, basic and diluted |  | 18,603,582 | 3,447,283 |  |
ASC 606 |  |  |  |  |
Liabilities and stockholders’ equity |  |  |  |  |
Deferred revenue |  |  |  | $ 770 |
Balances Without Adoption of Topic 606 |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | $ 11,298 |  |  |
Accounts receivable, net |  | 10,082 |  |  |
Inventory |  | 19,531 |  |  |
Prepaid expenses and other current assets |  | 6,430 |  |  |
Total current assets |  | 47,341 |  |  |
Property and equipment, net |  | 1,442 |  |  |
Other assets |  | 2,337 |  |  |
Total assets |  | 51,120 |  |  |
Liabilities and stockholders’ equity |  |  |  |  |
Current portion of long-term debt |  | 9,821 |  |  |
Accounts payable |  | 7,234 |  |  |
Accrued expenses |  | 10,265 |  |  |
Deferred revenue |  | 291 |  |  |
Total current liabilities |  | 27,611 |  |  |
Income tax payable |  | 1,931 |  |  |
Long-term debt, less current portion |  | 362 |  |  |
Total liabilities |  | 29,904 |  |  |
Commitments and contingencies |  |  |  |  |
Common stock, $0.001 par value per share; 100,000,000 shares authorized: 20,437,235 shares issued and outstanding at December 31, 2019; 100,000,000 shares authorized; 15,591,357 shares issued and outstanding at December 31, 2018 |  | 20 |  |  |
Preferred Stock |  |  |  |  |
Additional paid-in capital |  | 191,751 |  |  |
Accumulated deficit |  | (170,555) |  |  |
Total stockholders’ equity |  | 21,216 |  |  |
Total liabilities and stockholders’ equity |  | 51,120 |  |  |
Net revenues |  | 116,251 |  |  |
Cost of revenues |  | 80,258 |  |  |
Gross profit |  | 35,993 |  |  |
Operating expenses: |  |  |  |  |
Research and development |  | 28,742 |  |  |
Sales and marketing |  | 13,908 |  |  |
General and administrative |  | 16,182 |  |  |
Restructuring costs |  | 736 |  |  |
Total operating expenses |  | 59,568 |  |  |
Income (loss) from operations |  | (23,575) |  |  |
Interest expense |  | (1,522) |  |  |
Other expense, net |  | (543) |  |  |
Income (loss) before income taxes |  | (25,640) |  |  |
Income tax expense |  | (1,388) |  |  |
Net income (loss) |  | (27,028) |  |  |
Net loss attributable to common stockholders |  | $ (27,028) |  |  |
Net loss per share attributable to common stockholders, basic and diluted |  | $ (1.45) |  |  |
Weighted–average shares used in computing net loss per share attributable to common stockholders, basic and diluted |  | 18,603,582 |  |  |
Effect of Change Higher/(Lower) | ASC 606 |  |  |  |  |
Assets |  |  |  |  |
Other assets |  | $ 4,339 |  |  |
Total assets |  | 4,339 |  |  |
Liabilities and stockholders’ equity |  |  |  |  |
Income tax payable |  | 30 |  |  |
Total liabilities |  | 30 |  |  |
Commitments and contingencies |  |  |  |  |
Preferred Stock |  |  |  |  |
Accumulated deficit |  | 4,309 |  |  |
Total stockholders’ equity |  | 4,309 |  |  |
Total liabilities and stockholders’ equity |  | 4,339 |  |  |
Cost of revenues |  | 1,484 |  |  |
Gross profit |  | (1,484) |  |  |
Operating expenses: |  |  |  |  |
Research and development |  | (2,678) |  |  |
Total operating expenses |  | (2,678) |  |  |
Income (loss) from operations |  | 1,194 |  |  |
Income (loss) before income taxes |  | 1,194 |  |  |
Net income (loss) |  | 1,194 |  |  |
Net loss attributable to common stockholders |  | $ 1,194 |  |  |
Net loss per share attributable to common stockholders, basic and diluted |  | $ 0.06 |  |  |

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