Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands |
Total |
Outstanding Ordinary Shares [Member] |
Additional Paid-in Capital [Member] |
Accumulated Other Comprehensive Income (Loss) [Member] |
Retained Earnings [Member] |
| Beginning Balance, Amount at Jan. 31, 2018 |
$ 482,187
|
$ 15
|
$ 221,186
|
$ (279)
|
$ 261,265
|
| Beginning Balance, Shares at Jan. 31, 2018 |
|
33,489,614
|
|
|
|
| Cumulative effect of change in accounting principle |
43
|
$ 0
|
0
|
0
|
43
|
| Exercise of stock options, Amount |
305
|
$ 0
|
305
|
0
|
0
|
| Exercise of stock options, Shares |
|
42,483
|
|
|
|
| Vesting of restricted stock units, Amount |
0
|
$ 0
|
0
|
0
|
0
|
| Vesting of restricted stock units, Shares |
|
230,240
|
|
|
|
| Employee stock purchase plan, Amount |
2,818
|
$ 0
|
2,818
|
0
|
0
|
| Employee stock purchase plan, Shares |
|
71,415
|
|
|
|
| Stock repurchase, Amount |
(20,624)
|
$ 0
|
(20,624)
|
0
|
0
|
| Stock repurchase, Shares |
|
(437,448)
|
|
|
|
| Stock-based compensation expense related to stock awards granted to employees and consultants |
14,195
|
$ 0
|
14,195
|
0
|
0
|
| Net unrealized gains (losses) on investments - net of taxes |
(110)
|
0
|
0
|
(110)
|
0
|
| Net loss |
(10,006)
|
0
|
0
|
0
|
(10,006)
|
| Ending Balance, Amount at Apr. 30, 2018 |
468,808
|
$ 15
|
217,880
|
(389)
|
251,302
|
| Ending Balance, Shares at Apr. 30, 2018 |
|
33,396,304
|
|
|
|
| Beginning Balance, Amount at Jan. 31, 2019 |
$ 419,489
|
$ 15
|
188,516
|
97
|
230,861
|
| Beginning Balance, Shares at Jan. 31, 2019 |
32,303,540
|
32,303,540
|
|
|
|
| Exercise of stock options, Amount |
$ 1,520
|
$ 0
|
1,520
|
0
|
0
|
| Exercise of stock options, Shares |
101,645
|
101,645
|
|
|
|
| Vesting of restricted stock units, Amount |
$ 0
|
$ 0
|
0
|
0
|
0
|
| Vesting of restricted stock units, Shares |
|
233,656
|
|
|
|
| Employee stock purchase plan, Amount |
3,063
|
$ 0
|
3,063
|
0
|
0
|
| Employee stock purchase plan, Shares |
|
99,759
|
|
|
|
| Stock repurchase, Amount |
$ 0
|
$ 0
|
0
|
0
|
0
|
| Stock repurchase, Shares |
0
|
0
|
|
|
|
| Stock-based compensation expense related to stock awards granted to employees and consultants |
$ 15,423
|
$ 0
|
15,423
|
0
|
0
|
| Net unrealized gains (losses) on investments - net of taxes |
254
|
0
|
0
|
254
|
0
|
| Net loss |
(17,311)
|
0
|
0
|
0
|
(17,311)
|
| Ending Balance, Amount at Apr. 30, 2019 |
$ 422,438
|
$ 15
|
$ 208,522
|
$ 351
|
$ 213,550
|
| Ending Balance, Shares at Apr. 30, 2019 |
32,738,600
|
32,738,600
|
|
|
|