CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands |
3 Months Ended |
Mar. 31, 2018 |
Mar. 31, 2017 |
| Operating activities |
|
|
| Net loss |
$ (6,501)
|
$ (4,481)
|
| Adjustments to reconcile net loss: |
|
|
| Depreciation and amortization |
90
|
43
|
| Accretion of debt discount |
213
|
61
|
| Stock-based compensation expense |
55
|
54
|
| Change in the fair value of preferred stock warrants |
718
|
|
| Changes in operating assets and liabilities: |
|
|
| Accounts receivable |
399
|
(188)
|
| Inventories |
276
|
162
|
| Prepaid expenses and other assets |
(1,761)
|
(47)
|
| Accounts payable |
918
|
127
|
| Accrued expenses |
(825)
|
(1,091)
|
| Net cash used in operating activities |
(6,418)
|
(5,360)
|
| Investing activities |
|
|
| Purchases of property and equipment |
(7)
|
(206)
|
| Purchases of short-term investments |
(4,642)
|
|
| Proceeds from sales or maturities of short-term investments |
5,074
|
|
| Net cash provided by (used in) investing activities |
425
|
(206)
|
| Financing activities |
|
|
| Proceeds from issuance of notes payable |
8,000
|
458
|
| Proceeds from the exercise of stock options |
185
|
6
|
| Proceeds from sale of preferred stock |
|
24,968
|
| Net cash provided by financing activities |
8,185
|
25,432
|
| Increase in cash and cash equivalents |
2,192
|
19,866
|
| Cash and cash equivalents at beginning of period |
8,955
|
6,685
|
| Cash and cash equivalents at end of period |
11,147
|
26,551
|
| Supplemental cash flow information |
|
|
| Cash paid for interest |
347
|
308
|
| Issuance of preferred stock warrants |
$ 103
|
$ 4
|