Statements of Cash Flows - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Cash flows from operating activities: |
|
|
|
| Net loss |
$ (8,973)
|
$ (9,238)
|
$ (16,492)
|
| Adjustments to reconcile net loss to net cash used in operating activities: |
|
|
|
| Depreciation and amortization |
1,117
|
1,159
|
1,663
|
| Write-off of abandoned patents and licensed technology |
374
|
230
|
350
|
| Gain on sale of property and equipment |
0
|
(1)
|
(15)
|
| Compensation expense related to stock options and awards |
990
|
1,902
|
3,159
|
| Purchase of technology license with common stock |
0
|
775
|
0
|
| Changes in operating assets and liabilities: |
|
|
|
| Receivables and other assets |
(4,588)
|
(178)
|
412
|
| Accounts payable and accrued expenses |
557
|
(1,415)
|
1,635
|
| Deferred revenue |
2,768
|
250
|
(150)
|
| Deferred rent |
(633)
|
(432)
|
(368)
|
| Net cash used in operating activities |
(8,388)
|
(6,948)
|
(9,806)
|
| Cash flows from investing activities: |
|
|
|
| Maturities of marketable securities |
30,652
|
20,183
|
10,556
|
| Purchases of marketable securities |
(38,134)
|
(20,114)
|
(22,643)
|
| Purchases of property and equipment |
(255)
|
(72)
|
(85)
|
| Proceeds from the sale of property and equipment |
0
|
3
|
15
|
| Patent and licensed technology expenditures |
0
|
(53)
|
(269)
|
| Net cash used in investing activities |
(7,737)
|
(53)
|
(12,426)
|
| Cash flows from financing activities: |
|
|
|
| Net proceeds from issuance of common stock |
7,758
|
3
|
3,925
|
| Payment of withholding taxes for net settlement of restricted stock units |
(14)
|
(23)
|
(59)
|
| Net cash provided by (used in) financing activities |
7,744
|
(20)
|
3,866
|
| Net decrease in cash and cash equivalents |
(8,381)
|
(7,021)
|
(18,366)
|
| Cash and cash equivalents at beginning of year |
13,450
|
20,471
|
38,837
|
| Cash and cash equivalents at end of year |
$ 5,069
|
$ 13,450
|
$ 20,471
|