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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018
Cash flows from operating activities: |  |
Net loss | $ (4,740) | $ (3,685)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |
Stock-based compensation expense | 2,982 | 2,314
Depreciation and amortization of capital expenditures | 652 | 504
Amortization of acquired intangible assets | 207 | 145
Non-cash operating lease expense | 446 |
Amortization and accretion of premiums from investments | (126) | (57)
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 62 | (874)
Inventories and deferred inventory costs | (651) | (311)
Prepaid expenses and other assets | (1,005) | (564)
Accounts payable and other liabilities | (3,141) | 2,770
Deferred revenue | (430) | 52
Net cash (used in) provided by operating activities | (5,744) | 294
Cash flows from investing activities: |  |
Purchases of short-term investments | (15,345) | (5,409)
Proceeds from maturities and sales of short-term investments | 16,969 | 11,526
Capital expenditures | (602) | (405)
Business acquisition, net of cash assumed |  | (2,402)
Net cash provided by investing activities | 1,022 | 3,310
Cash flows from financing activities: |  |
Proceeds from issuance of common stock | 1,454 | 1,166
Net cash provided by financing activities | 724 | 407
Net (decrease) increase in cash and cash equivalents | (3,998) | 4,011
Cash and cash equivalents at beginning of period | 15,370 | 4,483
Cash and cash equivalents at end of period | 11,372 | 8,494
Restricted Stock Units (RSUs) |  |
Cash flows from financing activities: |  |
Shares repurchased for tax withholdings on vesting of restricted stock units ("RSU") | $ (730) | $ (759)

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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