	As of December 31,
	Note		2017		2018		2018
			RMB		RMB		US$
ASSETS
Current assets:
Cash and cash equivalents				95,890		2,071,921		301,348
Restricted cash				—		508,987		74,029
Short-term investments				372,747		2,524,609		367,189
Prepayments and other assets				851		8,791		1,279
Amounts due from entities within the Group				6,083,603		16,528,487		2,403,970

Total current assets				6,553,091		21,642,795		3,147,815

Non-current assets:
Long-term investments				—		137,564		20,008
Investment in subsidiaries, VIEs and VIEs’ subsidiaries				—		372,373		54,159
Amounts due from entities within the Group				1,614,857		695,906		101,215
Prepayments and other assets				130,116		—		—

Total non-current assets				1,744,973		1,205,843		175,382

Total assets				8,298,064		22,848,638		3,323,197

LIABILITIES, MEZZANINE EQUITY AND SHAREHOLDERS’ (DEFICIT)/EQUITY
Current liabilities
Accrued expenses and other liabilities				19,284		57,284		8,332

Non-current liabilities
Convertible senior notes		14		—		4,712,284		685,373
Other non-current liabilities				—		42,139		6,129

Total non-current liabilities				—		4,754,423		691,502

Total liabilities				19,284		4,811,707		699,834

Commitments and contingencies		17
Mezzanine equity:
Series A redeemable convertible preferred shares (par value of US$0.00001 per share; 200,000,000 and nil shares authorized, issued and outstanding as of December 31, 2017 and 2018, respectively)		24		606,140		—		—
Series A-1 redeemable convertible preferred shares (par value of US$0.00001 per share; 6,064,174 and nil shares authorized, issued and outstanding as of December 31, 2017 and 2018, respectively)		24		6,826		—		—

			As of December 31,
	Note		2017			2018			2018
			RMB			RMB			US$
Series B redeemable convertible preferred shares (par value of US$0.00001 per share; 123,103,264 and nil shares authorized, issued and outstanding as of December 31, 2017 and 2018, respectively)		24		1,546,912			—			—
Series C redeemable convertible preferred shares (par value of US$0.00001 per share; 302,891,196 and nil shares authorized, issued and outstanding as of December 31, 2017 and 2018, respectively)		24		954,544			—			—
Series D redeemable convertible preferred shares (par value of US$0.00001 per share; 848,682,647 and nil shares authorized, issued and outstanding as of December 31, 2017 and 2018, respectively)		24		3,195,670			—			—
Series E redeemable convertible preferred shares (par value of US$0.00001 per share; 686,646,383 and nil shares authorized, issued and outstanding as of December 31, 2017 and 2018, respectively)		24		2,344,683			—			—
Series F redeemable convertible preferred shares (par value of US$0.00001 per share; 546,999,817 and nil shares authorized, issued and outstanding as of December 31, 2017 and 2018, respectively)		24		3,530,583			—			—
Series G redeemable convertible preferred shares (par value of US$0.00001 per share; 1,014,436,019 and nil shares authorized, issued and outstanding as of December 31, 2017 and 2018, respectively)				10,416,306			—			—

Total mezzanine equity				22,601,664			—			—

Shareholders’ (deficit)/equity:
Ordinary shares (par value of US$0.00001 per share; 10,000,000,000 and nil shares authorized as of December 31, 2017 and 2018, respectively; 342,548,237 and nil shares issued and outstanding as of December 31, 2017 and 2018, respectively)		18		23			—			—
Class A ordinary shares (US$0.00001 par value; nil and 94,000,000,000 shares authorized as of December 31, 2017 and 2018, respectively; nil and 2,580,950,531 shares issued as of December 31, 2017 and 2018, respectively; nil and 2,199,425,905 shares outstanding as of December 31, 2017 and 2018,respectively)				—			138			20
Class B ordinary shares (US$0.00001 par value; nil and 5,000,000,000 shares authorized as of December 31, 2017 and 2018, respectively; nil and 2,876,391,396 shares issued and outstanding as of December 31, 2017 and 2018, respectively)				—			183			27
Additional paid-in capital				600,834			39,666,150			5,769,202
Accumulated deficit		19		(15,016,867	)		(23,509,486	)		(3,419,313	)
Accumulated other comprehensive income		25		93,126			1,879,946			273,427

Total shareholders’ (deficit)/equity				(14,322,884	)		18,036,931			2,623,363

Total liabilities, mezzanine equity and shareholders’ (deficit)/equity				8,298,064			22,848,638			3,323,197

Condensed Statements of Comprehensive Loss

	Year ended December 31,
		2016			2017			2018			2018
		RMB			RMB			RMB			US$
Operating costs and expenses:
Selling, general and administrative			(4,364	)		(6,058	)		(48,253	)		(7,018	)

Operating loss
Share of losses of subsidiaries, VIEs and VIEs’ subsidiaries			(2,991,812	)		(3,963,264	)		(8,573,048	)		(1,246,898	)
Interest income			23,759			101,851			260,360			37,868
Interest expenses			(13	)		(116,989	)		(25,550	)		(3,716	)
Foreign exchange (loss)/gain, net			(102,066	)		247,528			(694,907	)		(101,070	)
Other income/(expense), net			474			—			(28,378	)		(4,127	)

Net loss			(3,074,022	)		(3,736,932	)		(9,109,776	)		(1,324,961	)

Accretion of redeemable convertible preferred shares			(4,874,739	)		5,073,140			(298,990	)		(43,486	)
Extinguishment and reissuance of Series B preferred shares			—			(363,279	)		—			—

Net (loss)/income attributable to ordinary shareholders			(7,948,761	)		972,929			(9,408,766	)		(1,368,447	)

Other comprehensive income
Foreign currency translation adjustments			195,255			(264,774	)		1,787,553			259,989
Unrealized gains/(losses) on available-for-sale debt securities			2,978			(1,470	)		(733	)		(106	)

Total other comprehensive income/(loss), net of tax			198,233			(266,244	)		1,786,820			259,883

Comprehensive loss			(2,875,789	)		(4,003,176	)		(7,322,956	)		(1,065,078	)

Condensed Statements of Cash Flows

	Year ended December 31,
	2016			2017			2018			2018
	RMB			RMB			RMB			US$
Net cash provided by operating activities		15,882			55,245			87,322			12,700
Net cash used for investing activities		(859,698	)		(10,468,969	)		(17,575,740	)		(2,556,285	)
Net cash provided by financing activities		—			10,528,236			19,703,701			2,865,784
Effect of exchange rate changes on cash, cash equivalents and restricted cash		2,324			(217,839	)		269,735			39,231

Net (decrease)/increase in cash, cash equivalents and restricted cash		(841,492	)		(103,327	)		2,485,018			361,430
Cash, cash equivalents and restricted cash at the beginning of the year		1,040,709			199,217			95,890			13,947
Cash, cash equivalents and restricted cash at the end of the year		199,217			95,890			2,580,908			375,377

Basis of presentation

For the presentation of the parent company only condensed financial information, the Company records its investments in subsidiaries and VIEs under the equity method of accounting as prescribed in ASC 323. The subsidiaries, VIEs and VIEs’ subsidiaries losses are reported as “Share of losses of subsidiaries, VIEs and VIEs’ subsidiaries” on the condensed statements of comprehensive loss. Under the equity method of accounting, the Company’s carrying amount of its investment in subsidiaries for its share of the subsidiaries, VIEs and VIEs’ subsidiaries cumulative losses was reduced to nil as of December 31, 2017 and the carrying amount of “Amounts due from entities within the Group” was further adjusted as the Company committed to provide financial support to its VIEs as disclosed in note 1.

The subsidiaries did not pay any dividends to the Company for the periods presented.

The Company does not have significant commitments or long-term obligations as of the period end other than those presented.

The parent company only financial statements should be read in conjunction with the Company’s consolidated financial statements.