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CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 11 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities |  |  |
Net loss | $ (161) | $ (36,375) | $ (31,335)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation |  | 594 | 148
Amortization/accretion related to marketable securities |  | 648 | (41)
Stock-based compensation |  | 3,828 | 428
Change in fair value of convertible preferred stock liability |  |  | 17,600
Other |  |  | 40
Changes in operating assets and liabilities: |  |  |
Prepaid and other current assets | (12) | 290 | (1,265)
Other assets |  | (869) |
Accounts payable | 57 | 518 | 1,240
Accrued and other liabilities | 17 | 2,814 | 1,218
Other long-term liabilities | 3 | 695 | 639
Net cash used in operating activities | (96) | (27,857) | (11,328)
Cash flows from investing activities |  |  |
Purchases of marketable securities |  | (258,281) | (104,385)
Sales of marketable securities |  | 4,199 |
Maturities of marketable securities |  | 213,725 | 14,100
Purchase of property and equipment |  | (2,199) | (1,747)
Net cash used in investing activities |  | (42,556) | (92,032)
Cash flows from financing activities |  |  |
Proceeds from issuance of common stock in IPO, net of issuance costs | 2 | 71,354 |
Proceeds from issuance of convertible preferred stock, net of issuance costs | 12,611 |  | 95,569
Payment of offering costs |  |  | (729)
Proceeds from exercise of common stock options |  | 4 | 108
Net cash provided by financing activities | 12,613 | 71,358 | 94,948
Net increase in cash and cash equivalents | 12,517 | 945 | (8,412)
Cash and cash equivalents at beginning of the period |  | 4,105 | 12,517
Cash and cash equivalents at end of the period | 12,517 | 5,050 | 4,105
Supplemental disclosures of cash flow information |  |  |
Convertible preferred stock issuance costs incurred but not paid | 36 |  |
Purchases of property and equipment incurred but not paid |  | $ 84 | 286
Convertible preferred stock liability | $ 2,600 |  |
Deferred offering costs incurred but not paid |  |  | $ 222

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