Net Income (Loss) Per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Numerator:
Net income (loss)	$ 2,214	$ (1,340)
Net income (loss) attributable to common stockholders	$ 198	$ (1,340)
Denominator:
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic	109,708,898	80,623,861
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted	136,428,379	80,623,861
Net income (loss) per share attributable to common stockholders, basic	$ 0.00	$ (0.02)
Net income (loss) per share attributable to common stockholders, diluted	$ 0.00	$ (0.02)
Class A Common Stock
Numerator:
Reallocation of net income attributable to common stockholders	$ 15
Net income (loss) attributable to common stockholders	15
Reallocation of net income attributable to common stockholders	(3)
Net income (loss) attributable to common stockholders, diluted	$ 12
Denominator:
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic	8,393,169
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted	8,393,391
Net income (loss) per share attributable to common stockholders, basic	$ 0.00
Net income (loss) per share attributable to common stockholders, diluted	$ 0.00
Class B Common Stock
Numerator:
Net income (loss)	$ 2,214	$ (1,340)
Less: undistributed earnings attributable to participating securities	(2,016)
Reallocation of net income attributable to common stockholders	(15)
Net income (loss) attributable to common stockholders	183	(1,340)
Reallocation of net income attributable to common stockholders	3
Net income (loss) attributable to common stockholders, diluted	$ 186	$ (1,340)
Denominator:
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic	101,315,729	80,623,861
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted	128,034,988	80,623,861
Net income (loss) per share attributable to common stockholders, basic	$ 0.00	$ (0.02)
Net income (loss) per share attributable to common stockholders, diluted	$ 0.00	$ (0.02)