Fair Value Measurements (Tables)
|
6 Months Ended |
Jun. 30, 2019 |
|---|
| Fair Value Disclosures [Abstract] |
|
| Schedule of fair value of assets and liabilities measured on recurring basis |
| |
|
|
|
|
Quoted Prices |
|
|
|
|
|
|
|
| |
|
|
|
|
in Active |
|
|
Significant |
|
|
|
|
| |
|
|
|
|
Markets for |
|
|
Other |
|
|
Significant |
|
| |
|
|
|
|
Identical |
|
|
Observable |
|
|
Unobservable |
|
| |
|
|
|
|
Items |
|
|
Inputs |
|
|
Inputs |
|
| Balance at June 30, 2019 (in thousands) |
|
Total |
|
|
(Level 1) |
|
|
(Level 2) |
|
|
(Level 3) |
|
| Common stock warrant liability |
|
$ |
3,766 |
|
|
|
- |
|
|
|
- |
|
|
$ |
3,766 |
|
| |
|
$ |
3,766 |
|
|
|
- |
|
|
|
- |
|
|
$ |
3,766 |
|
|
| Schedule of reconciliation of common stock warrant liability measured at fair value on recurring basis |
| (in thousands) |
|
Series Q
common stock
warrant liability |
|
|
Series R
common stock
warrant liability |
|
|
Series S common
stock warrant
liability |
|
|
Total |
|
| Fair value of financial liabilities at December 31, 2018 |
|
$ |
511 |
|
|
$ |
- |
|
|
$ |
- |
|
|
$ |
511 |
|
| April 2019 Offering |
|
|
- |
|
|
|
2,605 |
|
|
|
250 |
|
|
|
2,855 |
|
| Change in the fair value of common stock warrant liabilities, net |
|
|
(30 |
) |
|
|
1,518 |
|
|
|
- |
|
|
|
1,488 |
|
| Adjustment for exercise of common stock warrant liabilities |
|
|
(241 |
) |
|
|
(597 |
) |
|
|
(250 |
) |
|
|
(1,088 |
) |
| Fair value of financial liabilities at June 30, 2019 |
|
$ |
240 |
|
|
$ |
3,526 |
|
|
$ |
- |
|
|
$ |
3,766 |
|
|
| Schedule of assumptions used for fair value measurements |
| |
|
Exercise
Price |
|
|
Strike Floor |
|
Closing
Market Price
(average) |
|
|
Risk-free
Rate |
|
|
Dividend
Yield |
|
|
Market
Price
Volatility |
|
|
Remaining
Term (years) |
|
| Series Q Common Stock Warrant Liability June 30, 2019 |
|
$ |
0.19 |
|
|
N/a |
|
$ |
0.28 |
|
|
|
1.76 |
% |
|
|
0.00 |
% |
|
|
151 |
% |
|
|
3.78 |
|
| Series R Common Stock Warrant Liability June 30, 2019 |
|
$ |
0.20 |
|
|
N/a |
|
$ |
0.28 |
|
|
|
1.76 |
% |
|
|
0.00 |
% |
|
|
151 |
% |
|
|
4.76 |
|
|